First of all we have to remove Newdotnet, either from add/remove programs, or by going here. & scrolling down to the uninstall tool.
Close all (browser) windows & rescan with hijackthis. When the scan is finished place a check in the box to the left of the following entries & click 'fix checked':
R3 - Default URLSearchHook is missing
O2 - BHO: (no name) - {00041A26-7033-432C-94C7-6371DE343822} - (no file)
O4 - HKLM\..\Run: [nscntrl] c:\windows\system\nscntrl.exe /noconnect
O4 - HKLM\..\Run: [glwjmgeb] c:\windows\system\glwjmgeb.exe /install
Reboot into safe mode following the instructions here & navigate to & delete the following if found:
c:\windows\system\nscntrl.exe
c:\windows\system\glwjmgeb.exe
Reboot normally.
If you want to stop a lot of the crap getting on your computer, uninstall Kazaa.
Go here for an on-line scan & set it to autoclean for you.
Try this scan as well.