I tried the registry fix:
And added: IRPStackSize with the value set at 59 (After having tried lower numbers previously).
After rebooting, I went to another computer on my LAN and the problem was still there.
I then uninstalled Acronis 2010. That did not fix the problem.
Then I cleaned the registry with WinASO, and also used CC Cleaner.
Tried removing the IRPStackSize line from the registry to put it back to where it was prior to the installation. Still no luck either before or after removing the registry line.
I do have an Acronis backup of the drive that was created about a day before I installed Acronis 2010. So, I could try restoring that using the restore disk.
I can't think of what else I could do.
Your help will be much appreciated.