I have a similar problem. I have WinXP & Win7 installed on two diff drives and all my data on the third drive. I went on to Win Media Center and added my music folders off the third drive; now one of them is inaccessible after rebooting. It just says "You don't currently have permission to access this folder Click Continue to permanantly get access to this folder" and when I click continue it says You have been denied access to this folder. I think it has something to do with the UAC. The funny part is that I'm the only user and administrator. I read the help and it says I could turn off UAC and it would require me to reboot; although not sure that's the best choice. This drive/folder is not accessible in WinXP either!
PLEASE HELP HELP HELP
Operating System Windows 7
Computer Type PC
CPU Type and Speed Quad Core
Motherboard Chipset Intel DP35DP
System Memory Type Corsair DDR2 667mhz 2x2GB
Video Card Type and Speed 256MB DDR 3 GeForce 8600GT
Computer Monitor Dell Ultrasharp 22"
Hard Drive 160GB + 500 GB + 1TB + 320GB
Optical Drives Sony DVD/RW
Network Adapter Intel
Anti-virus Software Quick Heal
Computer Skill Level Average Ability