Aside from the legal aspects of file-sharing, it is a common method of spreading malware; I suggest you remove Ares.
Update your Norton Antivirus program.
Download Ewido Security Suite from here:
http://fileforum.betanews.com/detail/ewido_security_suite/1098736486/1
Install and update it, and then close the program (don't scan yet).
Reboot into Safe Mode.
Do full system scans with Norton (first) and Ewido, allowing them to fix whatever they find (note, you will be posting the log from the Ewido scan with your next reply).
Still in Safe Mode, scan with HijackThis and have it fix the following entries:
O2 - BHO: (no name) - {5C8B2A36-3DB1-42A4-A3CB-D426709BBFEB} - (no file)
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=36467&clcid=0x409
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://zone.msn.com/binFramework/v10/ZIntro.cab34246.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} (PopCapLoader Object) - http://zone.msn.com/bingame/dim2/default/popcaploader_v6.cab
O23 - Service: hpdj - HP - C:\DOCUME~1\Nadia\LOCALS~1\Temp\hpdj.exe
Close any open windows, other then HijackThis, and hit Fix checked.
Go to C:\Documents and Settings\Nadia\Local Settings\Temp and delete the entire contents of the folder (but not the folder itself).
Empty your Recycle Bin and reboot normally.
Close any open browser windows, scan with HijackThis, and post a new log along with the Ewido log.