Suspect Sasser Virus
This issue is a strong symptom of the Sasser virus.
A quick work around (to allow you to upload the patch to your system)
As soon as your system has rebooted, get a command prompt up, and wait.
type in, but do not hit enter the following command shutdown -a (shutdown is an inbuilt command in XP) the -a parameter at the end stand for abort.
As soon as you get the message flash up on your screen that your system is being shutdown, click back on the Dos box, and now hit enter. this will abort the viral shutdown.
1) use windows update, or at least check windows regularly for updates.
2) ensure all accounts have passwords set, and make sure they are strong. (over 7 characters, with a mixture of uppercase, lowercase and numbers)
3) Install a firewall on your system, or at the very least enable the windows firewall (I use Zone alarm from [url]www.zonelabs.com[/url]. free and VERY good)
4) get some antivirus software (do a search for AVG. its not brilliant but it is free and it's better than nothing.)
If you are worried about forgetting your password, (set under control panel and user accounts) you can creat a password recovery disk for each user account. I strongly recommend that you carry this out.
Next free piece of software you need is from [url]www.lavasoft.de[/url] (NOT.DOM)
This is adaware SE and is probably one of the best spyware killers around.
Hope this helps some