Sasser computer worm wriggles worldwide more than a million people have been infected with this. It's another tcp/ip scanning virus/worm much like Blaster / Welchia so it doesn't need email to spread. Here's a list of affected software plus the windows updates, and there's a removal tool here - the FBI are looking for the writer, whilst the BBC try and out-do each other with the use of old irrelevant photos. there's also a network scanner here that will tell you if machines are vulnerable to it. if that all sounds too heavy, why not look at The Sony EyeToy Webcam

To summarise: If you are having problems with your computer, and you think you may have the "sasser" worm, then:

1. Scan with the symantec removal tool, even if it doesn't find it (ie your computer doesn't have the worm) still follow the next steps:
2. Install the windows patch, plus to make sure you're protected from other worms etc, get all the updates from windowsupdate.microsoft.com and then restart
3. If you're still having problems, try the Mcafee Stinger, as this will check for all the other new viruses and worms going around. (such as Blaster, Welchia, Sasser etc)

Other things you need to do regardless of whether you've got a virus or not is: make sure your anti-virus software is up to date, if you don't have any get AVG for free (www.grisoft.com) and set it to auto-update. Keep checking windowsupdate.microsoft.com for updates, or set Windows to auto-update in the Control Panel (if you have the right version of windows), plus you should think about setting up a personal firewall, such as ZoneAlarm (free), or something similar, especially if you've got broadband etc.