OK, well I guess whatever they tried didn't fix this particular issue.
Can you provide a list of the fonts (a directory listing of file names from C:\Windows\Fonts) installed on your machine?
Here is the content of a .bat file that should write a txt file into your per-user TEMP folder:
dir *.* > %temp%\fontlist.txt
To get to that folder after you run the batch file you can enter %TEMP% into the Windows Explorer address bar.
If you want to write elsewhere just change the path in line 3.
Then export the Fonts registry key and send the text content as well. It think that key is usually (always?) here:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
If you don't want to post that information here please submit a support case.
Hopefully this will give us a clue when I compare it to a working system here. That assumes my guess is correct.