I would suggest you do an online virus scan of your system (it's free) just to make sure you didn't get hit with a virus on the W98 system prior to networking it to XP. There are some viruses that actually disable your antivirus program and you have a false sense of security thinking your program is working properly when it isn't. An on-line scan will find anything that may be suspicious and for most viruses there are tools you can download that will remove stuff your antivirus program can't for some reason.

You can get an online scan for viruses, trojans and variants at: