Ok, thanks a lot, but I've already tried every of that methods, excepting disabling recording service (magically, I have none here!). Anyway, problem is now solved. What was wrong. There was a problem with swapping of cd devices. I have 2 : one Teac recorder and Pioneer dvd drive. So, when both of them were plugged on one connection tape (40 pin) - both were not working. But, somehow, XP was still remembering that DVD is E not D, and recorder is D. After unplugging recorder, ofcourse - drive letter has changed to D (for DVD) but it causes system not to access files via system mechanisms (why?). After connecting DVD together with HDD (80 pin connector) and TEac recorder alone everything went back to norm. Still, I have no clue where XP stores information about connected removable devices and their letters....