The preview feature in Windows Explorer is neat until you need to perform file management tasks on AVI files like deleting, renaming, or moving. You’ll often get “access denied” messages if you don’t let Windows finish its scan. So to remove this annoying feature, you can run these commands from a Command Prompt (Start -> Run, type in ‘cmd’ hit enter) to remove image and media preview:

regsvr32 /u shimgvw.dll
regsvr32 /u shmedia.dll

Of course, if you need to re-enable image and media preview, use these commands:

regsvr32 shimgvw.dll
regsvr32 shmedia.dll