If it's virus checker related you might try using the "no save" trial version instead - the regular 30-day trial version is protected by a system called WinLicense and at least one virus checking system (ESET I think) will tend to flag anything protected with that as a virus, maybe that's what you are running into. The "no save" trial version and also the regular full version do not have that on them so if that's the problem they would probably not trigger it.

- Michael