how to permanently delete the 0 byte avi, wmv files?

0 byte avi, wmv,mpeg-4, etc,get automatically created in one of the folders. i have deleted them many times but after some time they again get created. is it a some kind of virus. i have nod32 and have scanned those files.
so what di i do now

Remove this key:

HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\RecentFileList

+restart

it says that deletion will cause system instabilty.
is it ok to delete those hkeys now?
waiting for your rply
thank you

is it ok to delete those hkeys now?

Click to expand...

Of course.I can sure you will not have any troubles.