In message , Jim Thompson writes
If you can run Forte agent with task manager have you tried starting Explorer again?
Put the drive in another machine, make a complete backup of it, put it back where it came from, then, from the task manager, run the last service pack you installed (SP4 I hope unless you're running SQL Personal). Providing this brings the machine back, you need to re-apply all the hotfixes and scan the drives for errors.
None.