error:windows explorer has stopped working

Hi

my windows is 32bit.

I have changed from 64 bit to 32 bit a couple of month ago

now I have problems with some video files.

sometimes and I dont really know why if I open the folder containing the video file suddenly an alert window appear that is said :

the windows explorer has stopped working.after this message all of desktop items,task bar,... they disappear accentually the desktop reboot and close that folder.
if i copy the file in the desktop by mistake i cant even use my windows unless i had another account to delete it using cmd.

I didint have this problem before that I have 32 bit.i tested the file in another laptop with 32bit and it was ok.

did i do something wrong during installation?
please help me.its driving me crazy.

and also my system function is so slow what can i do about that?

Run an SFC scan and a Malware scan
SFC /SCANNOW Command - System File Checker
Malwarebytes : Free anti-malware, anti-virus and spyware removal download

Post back with your results.
Do you have any codec packs installed?

the scan doesn't go further than 14% (is there any software to help me doing it instead of using command ?)
and it says: it cant complete cause of resource protection
i opened the command with run as administrative

and yes i have installed windows 7 codec pac
and also divx plus software.

pinklotus said:

the scan doesn't go further than 14% (is there any software to help me doing it instead of using command ?)
and it says: it cant complete cause of resource protection
i opened the command with run as administrative

and yes i have installed windows 7 codec pac
and also divx plus software.

I would recommend uninstalling this pack since they have some components which enable Windows Explorer to display Thumbnails on unsupported file formats which can cause the latter to become unresponsive.

thanks alot
and i had malwares in my windows
i will uninstall it and see if it works