The 21 greatest PC mysteries -- solved!

Find out why your documents won’t print, where your downloads disappear to, what a .dat file is and much more.

By Rick Broida, PC World |  Windows, troubleshooting

Most Adobe and Java patches are made to plug security holes, so you should update them--or use alternative software.

Is it absolutely necessary to update Windows?

Yes, you should definitely apply Windows updates for security reasons, but you can take a few steps to cut down Windows' nagging.

Does it matter whether I 'Safely Remove' devices?

Absolutely: If you ignore Windows' requests to "Safely Remove" your storage media, you could end up with corrupted files, un­­readable media, or both.

Windows asks me if I want to enable Sticky Keys. What are they, and how should I use them?

The Sticky Keys feature makes certain keyboard functions easier to access.

Why can't I send out a particular file attachment through e-mail?

The file is probably too large. Check out free services that let you work around file-size restrictions.

How can I determine whether an unknown Website is safe to visit?

Read our suggestions on figuring out whether a link is safe from malware or other threats before you click it.

What are the .dat files I sometimes receive in e-mail messages, and how do I open them?

Microsoft Outlook uses a modified version of Rich Text Format to preserve fonts and the like, but it often causes problems for the recipient. We have three suggestions for coping.


Originally published on PC World |  Click here to read the original story.
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