Movie Thumbnails are taking way too long to load

Hi !!

I'm having an issue with the loading time of my thumbnail movie files. The drive itself is not a network drive by the way, it's in my local computer. (Windows 7 Ultimate 64)

For some strange reason, since a couple of days, the thumbnails take forever to load. The green bar is a never ending story...

Here is what I did to date to try to fix it:

- Reset windows cache
- Applied a patch to the registry to reactivate the cache
- In the properties of the folder, changed from "videos" to "General Items"
- Reinstalled codec pack
- Reinstalled chipset drivers

*I do use CCleaner (not on a daily bases),but disable the option the clear cache.
* Windows file indexing is turned on
*Hard Drive is 0% fragmented


Any help would be appreciated !

Thanks