23 Feb 2009 at 01:55 - 4
What Fril said, texmod can sometimes contain trojans or other malicious stuff if it comes from an unsafe source.
First things first: Remove/quarintine the trojan, then change your password, then restart your computer and scan again to be extra safe.
If you have never used texmod it's likely that you stumbled upon some sort of unsafe website or got a bogus GW2 beta email and opened it. There are many possibilities, so cover all your bases.