There are a number of things that could be the issue here, corrupted file, something hooked to explore not responding, spyware …
First lets see what happens if you boot into safe mode:
Restart Windows, after you see the BIOS screen and before Windows starts to load.
Start tapping the F8 key. The Windows Advanced Options Menu appears.
Use the Arrow key to ensure that the Safe Mode option is selected.
Press Enter. The computer then begins to start in Safe mode.
If everything loads ok in safe mode, then it something being loaded through the registry then it is most likely hooked to explorer.exe
In that case then we will have to find out what’s loading
Please download , and unzip it to it's own folder.
Not a temp folder please
(If you have broadband then you can achieve this by booting into safe mode with networking.
Using the method list above just select safe mode with networking.)
Once you download and unzipped HijackThis start HijackThis and select 'Do a system scan and save a logfile'
Now post the contents of the logfile back into this thread

