So you can open things that are on your desktop but nothing else....
Looks like an windows explorer problem. What did you do before this started?
Did you try safe mode and then do a system restore. Need more input.
Asus P4P800 SE
Intel P4 3.2 Gig 1024 Meg PC3200 cas latency 2.5
RAID 0 2-36.7 Gig SATA WD 10,000 RPM
200 Gig WD ATI ALL-IN-WONDER 9600XT
6500 Kb bandwith Internet Connection