I am in the market for a new Windows computer, but I prefer the Windows XP operating system, not Vista. I understand Microsoft has now barred the major PC vendors from selling XP systems. Is there a way I can get around this?

If you want a new, brand-name PC that comes pre-loaded with the seven-year-old Windows XP operating system, you can still get one through an odd and circuitous process. Most major PC makers will sell you selected Vista models with an option, which sometimes costs extra, officially called a “downgrade,” but sometimes marketed as an “upgrade” or “bonus.” You may have to hunt through the selections offered by the computer makers to find one that has this XP option.

When you order a PC in this fashion, you are technically buying a Vista machine, and Microsoft counts it as a Vista sale. But the computer company actually loads XP on the new hardware, in place of Vista, before it leaves the factory. In many cases, you also get discs containing Vista, in the event you wish to switch to the newer Vista operating system later.

I was wondering if you could give me some suggestions of a small, light portable radio-type gadget with earbuds that would be good for me while I do athletic activities like riding my bike. I want something that will give me different pre-programmed selections of music, not something that I have to load with music (I don’t remember names of songs). I love my Sirius satellite radio in my car.

My first reaction is to suggest you simply get the portable, small, personal Sirius radio that is meant for carrying on your person. It’s called the Stiletto 2 and costs around $300. Like the one in your car, it does require a subscription, but it is much smaller. I haven’t tested it, but you can get more information at sirius.com.

However, this unit isn’t in the smallest class of portable music players, so another alternative might be to get a very small portable player, which, while it allows you to download music, also has a built-in FM radio. Among these is the smallest Microsoft Zune, called the Zune 4 GB, at about $100, and the Sansa Clip, starting at about $35. Neither requires a subscription fee. Information is at zune.com and sansa.com.

The popular Rhapsody subscription music service is also available on portable players, and offers pre-programmed channels of music. Some of these players also include FM radios. Information on these is at learn.rhapsody.com/devices.

Last week, you said you didn’t know of a dedicated gadget that simply allows people to both send and receive emails. What about the MailBug?

Thanks for reminding me. The MailBug, which I haven’t tested, is a small, text-only terminal for sending and receiving email over a dial-up connection. It costs about $125 and requires a companion email service that is about $100 a year. It’s made by a company called Landel and can be ordered at mailbug.com.

While the device itself can’t send or receive photos or other nontext attachments, account holders with access to a computer can view such attachments via a Web-based version of their email accounts.

You can find Mossberg’s Mailbox, and my other columns, online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.

Here are a few questions about computers I’ve received recently from people like you, and my answers. I have edited and restated the questions a bit, for readability. This week my mailbox contained questions about getting viruses from file-swapping services, other options beyond dial-up Internet access, and buying a Mac desktop computer.

If you have a question, send it to me at mossberg@wsj.com, and I may select it to be answered here in Mossberg’s Mailbox.

Are there problems with using file-swapping sites like Kazaa, as long as you have a good antivirus protection program? I don’t mind paying for individual songs, but other sites like iTunes or Rhapsody often don’t have the songs I want.

Yes, there are problems. The first are the ethical and legal issues arising from obtaining somebody else’s copyrighted intellectual property without paying for it, from a person who isn’t licensed or authorized to distribute it. The other sites you mention, iTunes and Rhapsody, are legally licensed to distribute music. Kazaa and its ilk aren’t, nor are the people who make music available through them. Your argument is like rationalizing buying stolen TVs because your local Best Buy didn’t have the model you wanted.

If your conscience can get past that, there are practical issues. These sites are major transmitters not only of viruses, but of spyware, which your antivirus program can’t stop. Even if your PC has a full, up-to-date security suite, with antispyware software, you are asking for trouble by downloading from “file swapping” sites. Many of the people I hear from who have had to take drastic, costly steps to save heavily infected PCs attribute their problems to the fact that their kids were frequenting file-sharing sites.

I currently have dial-up access to the Internet, which is slow. I pay a total of $35-$40 a month for the Internet service itself, plus a dedicated phone line. I see ads that claim I can give up this dial-up service and the extra phone line and somehow get higher-speed Internet access for less. Is this true? I do not have a cellphone or wireless service into my house, though I do have cable TV.

You can definitely save a lot of money on your Internet service, and drastically increase speed at the same time. And you don’t need cellphone or wireless service at all. They are irrelevant. Your choices are DSL from your phone company, or cable-modem service from your cable TV provider. Either will give you a high-speed broadband connection that is much, much faster than your current dial-up service — without tying up your phone line. You can go down to a single phone line for making voice calls.

DSL tends to be a lot cheaper, so I recommend DSL if you want to save money. And, while the low-priced DSL service is a lot slower than a cable modem, it is much cheaper and still is roughly 15 times as fast as your current connection.

Verizon offers a low-end DSL service for $14.95 a month, with the first month free. It’s much faster than what you have now, and you wouldn’t need the second phone line. Other companies may have similar offers. But you should go to your phone company’s DSL Web site first to see if your house qualifies for DSL. Not all homes do; it depends on how far you live from the nearest phone company facility.

I am a Windows user who wants to switch to Mac, and I have found two options suitable for me. The first option is to buy the $1,299 iMac G5. And the second option is to buy the Mac mini with the 1.42 GHz processor, 1 GB of memory and a 100 GB hard drive.

It all depends on what you do on your computer and on what your plans are. The mini, configured as you specify, will cost you $500 less than the iMac. But it is less powerful and less full-featured than the iMac. And it lacks a monitor, keyboard, mouse and speakers, all of which come with the iMac. If you have all of these on your Windows PC, and like them, and don’t plan to keep the Windows PC, you can switch them over to the mini. But you’ll still have to buy a peripheral called a USB hub, because the mini has too few ports. If you want to preserve your Windows machine, you’ll have to buy new peripherals, or a gadget called a KVM that allows the mini and your Windows machine to share the peripherals.

The iMac G5, in my view, is the best consumer desktop on the market, and the $1,299 model has just been upgraded, without a price increase. So, if your computing needs are modest, your budget is limited and you’re ready and willing to switch over your Windows peripherals, the mini would be a better bargain. But the iMac is the better computer.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

Write to Walter S. Mossberg at mossberg@wsj.com