I've been playing Stalker Clear Sky for a couple hours. I was about to change levels (going to "the garbage") and I got a crash to desktop. I clicked on submit for the error that popped up and had to close it from task manager (it wouldn't close).
I restarted my PC and now my DVD and DVD/RW drives are both missing from Windows. They do work by pressing the eject button.
The only "mod" I'm using is Clear Sky Complete.
Restarted once again (checked to see if the drives were showing in BIOS and they are). Now the drives show up in Windows. Weird.