I found an old post with this problem and have tried the solutions there without success:
Rebooted computer several times.
Tried a software repair. Rebooted several more times.
Downloaded the Support Tool and ran it, generated the relevant file.
The other thread said to PM the file to Christian, I tried doing this and it gave a message saying this person cannot receive PM's.
Please help with how to fix this problem, I have run out of solutions!