[Jazz]

Do you have quality AntiVirus and Firewall programs installed, properly configured and up-to-date?

Apply the following patch, for starters: -

Microsoft Security Bulletin MS06-040 - Vulnerability in Server Service Could Allow Remote Code Execution (921883)

Also, as you have Internet access, to a degree, dl, install and run CCleaner. Do NOT use the Issues section.

Then dl, install, update and run the following. They both have a free 30 day full feature trial and then revert to free, limited feature versions that are still good: -

AVG Anti-Spyware 7.5

and

a-squared Anti-Malware 2.1

Save the scan results, as you may need then at a later date.

Also run the following: -

Panda ActiveScan

NOTE: If the scans find any infections, you must disable System Restore, prior to purging your system, as follows: -

Article ID : 310405

How to turn on and turn off System Restore in Windows XP

Let us know how you get on.