From your Hijackthis log I found these dubious:

C:\DOCUME~1\sposes\LOCALS~1\Temp\DGQSL.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{BD10805D-7681-4CD3-85A6-A4891DCD7322}: NameServer = 127.0.0.1
O17 - HKLM\System\CCS\Services\Tcpip\..\{BEEB5C98-3661-4188-B9E2-232D4F01E9DB}: NameServer = 4.2.2.1
O17 - HKLM\System\CCS\Services\Tcpip\..\{F09A0128-2094-49A5-8D6B-306D1C585F56}: NameServer = 127.0.0.1
O23 - Service: DGQSL - Sysinternals - www.sysinternals.com - C:\DOCUME~1\sposes\LOCALS~1\Temp\DGQSL.exe

You might want to remove these too:
O16 - DPF: {0E5F0222-96B9-11D3-8997-00104BD12D94} (PCPitstop Utility) - http://www.pcpitstop.com/pcpitstop/PCPitStop.CAB
O16 - DPF: {556DDE35-E955-11D0-A707-000000521957} - http://www.xblock.com/download/xclean_micro.exe


The hidden folder named "NetworkService" in "Documents and Settings" is normal..