Windows 7: Videos thumbnails are re-created every time (not cached)

Hi

I use windows 7 home premium and i have a very annoying problem with my folder with video (or pictures)

When i open a folder with the thumbnails view, it re-create every thumbnails, it is very slow...

I know there is a tips there to Enable or Disable the Thumbnail Cache: Thumbnail Cache - Enable or Disable

-> ok, it's enabled

I have Windows 7 home premium so i can't use the Local Group Policy Editor...

I apply another tips, to Prevent Windows from Deleting the Thumbnail Cache: Thumbnail Cache - Prevent Windows from Deleting


-> ok i do this but when i check the properties of this folder:

C:\Users\User-Name\AppData\Local\Microsoft\Windows\Explorer

It is only 79 ko, so i think there is any thumbnails cached inside....

In this folder, i have these files:



ExplorerStartupLog.etl = 32 ko (last modifiy date = 2011)
ExplorerStartupLog_RunOnce.etl = 16 ko (last modifiy date= last month)
thumbcache_idx.db = 4 ko (last modifiy date= 3 days ago)

and i have another folder "ThumbCacheToDelete" with many 0 Ko files with today date...

What can i do to have the thumbnails cached and not re-created every time ?

Thanks