Symptoms of a virus infection

How do you know you may be infected with a virus?

Symptoms may be:

  • unexplained messages or images appear all of a sudden

  • unusual sounds or music is being played when not expected

  • your CD-ROM drive opens and closes mysteriously

  • programs start suddenly

  • your firewall alerts you that some appl wants to connect to the Internet

  • your friends mention they have had messages, which you did not send

  • your mailbox contains a lot of messages without a sender’s e-mail address

Secondary symptons could be:

  • your computer halts or freezes or encounters errors

  • your computer slows down when programs are started

  • files and folders have been deleted or emptied or changed

  • your harddrive is accessed too often

  • Microsoft Internet Explorer freezes or functions erratically or you cannot close the application running

If someone knows more please add to this listing.
It is not complete.

polonus

http://support.microsoft.com/kb/129972
Some of these are already covered in your post polonus.