I have a vision problem and can barely read low-contrast print, even the light colors on your Web site. Any ideas for how I and others can solve this problem? I use a Mac and the Firefox Web browser.

A: If your Mac is running the Leopard or Snow Leopard operating systems, you can use an onscreen slider control or keyboard commands to enhance the contrast. You can even switch the display to white-on-black, which really boosts the effect. This works system-wide. These settings are found in System Preferences, under the Universal Access preference, in the tab called “Seeing,” in the section called “Display.”

The new Windows 7 also has a similar feature that applies a “high contrast theme” when you press a certain key combination. It can be enabled or disabled in the Control Panel, under Ease of Access. You click on “Ease of Access Center,” and then “Make the computer easier to see.”

Where can I download the Windows 7 Home Premium upgrade edition for my Vista Home Premium computer?

A: Windows 7 can be downloaded at http://store.microsoft.com/home.aspx. And, after you’ve installed it, you can upgrade to higher versions anytime, if you like, for a fee. This is called the Windows Anytime Upgrade, and is explained at this site: http://bit.ly/VrV58.

Do you know if the new Windows 7 Home Premium will be offered at less than the retail price of $120 to current Vista PC owners who wish to upgrade?

A: That $120 price is the upgrade price for Vista owners moving to Windows 7 Home Premium, though of course some retailers might discount it. The “full,” or non-upgrade, edition of Home Premium lists for $200. Microsoft did run a sale on Windows 7 pre-orders earlier this year, but that’s over.

You can also get a Windows 7 upgrade from participating PC makers free, or for a nominal fee, if you buy a new PC equipped with Vista before the end of January, 2010, or bought one after June 26, 2009. For the latter offer, consult: http://bit.ly/rjAz4.

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

Corrections & Amplifications

An earlier version of this column erroneously stated that Windows 7 had to be purchased on a disk.

In the new version of Microsoft Office, I cannot find a “favorites” capability in the Open dialog box. In my older version, when I began to open a document, I had a box on the left called “Favorites” that I could invoke to find common file locations. Did they really kill this very useful feature?

No, but they changed the way you make it visible in Office 2007. You can get back your “Favorites” category by right-clicking the bar at the left-hand side of the Open dialog. From the menu that appears, click on “Add Favorites,” and your Favorites category should appear in the left-hand bar, and stay there.

If I have McAfee security software, do I need an antispyware program as well?

Everyone running a Windows computer, even a virtual Windows computer on a Mac, should have antispyware software. In some ways, spyware is a worse security problem than viruses, and can lead to identity theft.

McAfee has made many types and versions of security software over the years. Some, especially recent versions of the company’s comprehensive products, include antispyware protection. Check your version to make sure it includes this capability. If it doesn’t, you will either need to upgrade to a more comprehensive suite, or obtain a separate anti-spyware product.

When my friend put a Spike Jones CD of mine into his Mac to import it using iTunes, the CD was misidentified with an embarrassing title. What would cause such a thing to happen? Does iTunes go out to the Web looking for album names, instead of going by what’s on a disk?

Yes. Music programs like iTunes, and all its major competitors, can’t identify a disk directly. So they rely on online databases to identify CDs. Each CD contains a hidden code that the database providers quickly match up with their huge catalogs of CDs to provide the album title, artist, date, track list and other information. But, sometimes, especially when the CD is relatively obscure, the databases are wrong and yield erroneous information. When that happens, you have to type in the information by hand.

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