System specs (no OC):

Q9550 w/ Asus P5Q mobo, 2GB Corsair XMS2 RAM
Palit HD 4870 Dual Sonic 1GB
SATA Hdisks, all seagate: 80gb(boot), 500GB, 1TB (NO RAID)
Installed with DT Lite latest version, 1.62 STPD
Marvell IDE disabled

Problem:

PC freezes always when copying/running files from mounted image while playing media files either w/ any versions of VLC or Win MP. Freezing doesn't occur when not playing media files.

Please help.