Trojan Horse that possibly isn't there?

[Soriasis]

I'm having a problem with my programs. I am using Norton Antivirus 2007.

I installed Counter Strike Source some time ago, around 2-3 months and haven't played it since. Today I decided to open it up and play it. As it said "Counter Strike Source loading..." a small box appeared on the bottom right saying that Symantec successfully blocked a Trojan Horse and that my computer is secure. Then it showed that my CS Source could not open and I should try again later. I opened up my activity logs and this is what I got:

Source: C:\Documents and Settings\Bryan\Local Settings\Temp\~4.tmp
Risk category: Virus
Overall Risk Impact: High
Click for more information about this risk : Trojan Horse
Action taken: Blocked

I tried to open up CS Source a few more times, and each log giving me a different ~(number).tmp.

I then proceeded on scanning my Documents and Settings and there were no viruses whatsoever. Is there a solution to this without having to disable my Antivirus?

[flanzig1]

Would try doing an on-line scan at Trend Micro to see if there are real nasties on your PC or if Norton is giving a false postive.

[dcooper]

Yes Norton can give false positives, but first which version do you have? And have you considered steering away from the complete security suites and using seperate programs?