Good
Looking over your log, it seems you don't have any evidence of an anti-virus software.
Anti-virus software are programs that detect, cleanse, and erase harmful virus files on a computer, Web server, or network. Unchecked, virus files can unintentionally be forwarded to others, including trading partners and thereby spreading infection. Because new viruses regularly emerge, anti-virus software should be updated frequently. Anti-virus software can scan the computer memory and disk drives for malicious code. They can alert the user if a virus is present, and will clean, delete (or quarantine) infected files or directories. Please download a free anti-virus software from one these excellent vendors NOW:
1) Antivir PersonalEdition Classic - Free anti-virus software for Windows. Free support.
2) avast! 4 Home Edition - Anti-virus program for Windows. The home edition is freeware for noncommercial users.
3) AVG Anti-Virus Free Edition - Free edition of the AVG anti-virus program for Windows.
You should run only one antivirus program at a time. Having more than one antivirus program active in memory uses additional resources and results in program conflicts and false virus alerts.
Please post a fresh hijackthis log afterwards.