O4 - HKLM\..\Run: [msbb.exe] C:\WINDOWS\system32\msbb.exe
Close ALL open windows except for HiJackThis and hit FIX CHECKED.
Next:
1) Please download the Killbox by Option^Explicit.
2) Save it to your desktop.
3) Run Killbox.exe.
4) Select "Delete on Reboot".
5) Copy the file names below to the clipboard by highlighting ALL of them then press CTRL + C
C:\WINDOWS\system32\msbb.exe
6) Return to Killbox, go to the File menu, and choose "Paste from Clipboard".
7) Click the red-and-white "Delete File" button. Click "Yes" at the Delete on Reboot prompt. If your computer does not restart automatically, please restart it manually.
Reboot.
Let me know how's the system running..