While attempting to run updates to the Spybot Search & Destroy, lately, I am getting the following error messages for Detection Rules and English language i.e.: !!!Bad Checksum!

I am running on Windows 98. I have Norton SystemWorks 2005, Norton Personal Firewall 2005, Spyware Doctor, aD-aWARE SE Personal, ccleaner, and Spyblaster.

Daily I run a combination of these including Spybot including Spybot-SD Resident. Spyware Doctor is consistently finding the trojan named Trojan.StartPage.Gen. We are running AIM and everytime it launches, the Trojan is introduced. None of the other programs are finding the problem - thought Spyware doctor is detecting it and cleaning it, it is not protecting against it.

I suspect that the fact that I am getting the error is negating the ability for the Spybot program to find the problem. Please advise