PestSweeper is a rogue antispyware. Usuallly, rogue antispyware infects systems via misleading advertising on free download, warez and porn websites, trojans and browser security holes. PestSweeper reports false or exaggerated system security threats on the computer. The user is then prompted to pay for a full license of the application in order to remove the errors.
PestSweeper can be installed from the PestSweeper . com
Hijackthis shows infection:
O4 – HKLM\..\Run: [pestsweeper] C:\Program Files\PestSweeper\pestsweeper.exe
If you can`t to remove PestSweeper, I would recommend that you follow the instructions – how to use Spyware Removal Forum and post your logs in the spyware removal forum. I will check your logs and advise you on PestSweeper removal.