My advice is to talk to your VAR and see if they can help you with this.
EPDM 2010 SP2
I have had this happen, not with reinstall but for other issues. You will loose you desktop data or any changes to the files but try a "Undo Check Out" of the files.
Copy the files out of the database before doing this.
If you have good local copies of the most recent version you can:
1 - Undo Check Out on all problem files
2 - Check the files out
3 - Overwrite the files with the newer local copy
4 - Check In
You shouldn't lose any data this way.
Check with your VAR and suggest KB solution S-038423
-Tor Iveroth, SolidWorks support