Scan with HijackThis and then place a check next to all the following, if present:


O4 - HKLM\..\Run: [NBKeyScan] "C:\Program Files\Nero\Nero8\Nero BackItUp\NBKeyScan.exe"
O4 - HKLM\..\RunOnce: [Launcher] %WINDIR%\SMINST\launcher.exe


Now, close all instances of Internet Explorer and any other windows you have open except HiJackThis, click "Fix checked".

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Download and Run ATF Cleaner
Download ATF (Atribune Temp File) Cleaner© by Atribune to your desktop.

Double-click ATF Cleaner.exe to open it.

Under Main choose:
Windows Temp
Current User Temp
All Users Temp
Cookies
Temporary Internet Files
Prefetch
Java Cache
*The other boxes are optional*
Then click the Empty Selected button.

Firefox:
Click Firefox at the top and choose: Select All
Click the Empty Selected button.
NOTE: If you would like to keep your saved passwords, please click NO at the prompt.

Opera:
Click Opera at the top and choose: Select All
Click the Empty Selected button.
NOTE: If you would like to keep your saved passwords, please click NO at the prompt.

Click Exit on the Main menu to close the program

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Reboot.

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After rebooting, rescan with hijackthis and post back a new log. Please let me know how your pc is now.