Explorer.Exe consuming 100 % of CPU and physical memory by 50 percent

Hi,
It all starts when i try to open one flv video downloaded from you tube to my desktop.when i try to open it in VLC player.it doesn't do anything ,laptop goes hang.I checked my task manager and found that explorer.exe is consuming 100 % of cpu .I exit my explorer by endprocess and later on on activate from new task.I some how manged to delete that file. But now problem is that when i try to open some video file,the moment i right click the file ,explorer.axe goes 100 percent and system hangs..

Now every time i have to exit explorer when this happens.Now I am gone mad with this and want to get rid from this . I have found many remedies from net ,but didnt make it all sucess.

please help me anybody to come from hell out of this issue..please...

My OS is windows 7 home premium 32 bit. and lap is Compaq presario. CQ 61

Run a scan of Malwarebytes in safe mode

Ya.. i had tried that also.. completely checked my lap for virus ,malware and spy ware.. but cant find out any thing..

Try the SFC tool SFC /SCANNOW Command - System File Checker