|"yes, I have a back up :)"|
Ah, a very knowledgeable person ;-)
It shouldn't make any difference, but is this drive FAT16, FAT32 or NTFS?
(edit) Oops I see it's NTFS
How about trying Windows Explorer? C:\windows\explorer.exe
(edit) Having so many files in a folder really slows accesses down. Have you considered splitting that folder up, or is that not practical?
The three most important things in computing:
1. Backups, 2. Backups and 3. Backups.