Thanks for your reply.
First test your memory
I have tested my memory some time ago with Memtest86 (a few passes) and it didn't find any errors. I have 2x2GB of RAM, maybe I should test only one at a time? Or take one out and check if blue screen appear? The only problem is the it happens very rarely so it may take a looong time to check which one is faulty.
Second remove your video driver
I'll reinstall my video driver using the cleaner.
Third run a system file check
Done. Windows Resource Protection did not find any integrity violations.
in another your USBUCHI.
If this one caused the latest one, maybe it's because I bought a Creative external sound card on usb (Creative Sound Blaster 24-bit External USB)? It sometimes act strangly (hearing something like knocking?,I have to restart the program that uses the sound card - AIMP2,WMP11,BestPlayer - didn't have this problem in games though). Despite all, what can do about that?
As for the old drivers:
-OEM02Vfx and OEM02Dev.sys are from the Integrated Camera from Creative and I didn't find any new drivers (neither at Dell.com nor the internet)
-mcdbus.sys - I don't use MagicISO any more, it's just some junk
-spldr.sys - a part of Windows OS, I don't know how to update this (all updates from Microsoft installed)
-amxdata.sys - same as before, don't know how to update it
-rimspx64.sys, rixdpx64.sys and rimmpx64.sys are for RICOH Card Reader - AFAIK I have the latest drivers
I have uninstalled the drivers for the video card and cleaned the rest with the Driver Sweeper. After the restart, when I double clicked the file with new drivers, system crashed. After another restart, while doing the same thing, another crash. I attach the file with minidumps from those 2 crashes. Hope you will help me find the cause of them.