I have Win 98. I downloaded SWB 3.4 and installed it. When I clicked to run it the screen went blank and then I got a fatal exception OE at 0028:0000000F. I removed Spywareblaster 3.4 from the computer and deleted any old files. Reinstalled 3.4 and got the same fatal exception except I think there may have been a 13 at the end instead of F. Removed it again and reinstalled 2.6.1. No problems with that version. Do I need to do something with the old version before installing the new one? I am also running Spyware Guard and AntiVir.