Not sure if you can take it directly from the play disc, couldn't hurt to try.  If your game is modded, copy it into another  
folder (call it GTAVC BACKUP or similar) & wipe the the original, then defrag your drive (Windows is a little lazy & will  
re-use the old files if it finds them).  Once re-installed, copy the un-modded files to another folder (this one named  
GTAVC OEM) & start copying your modded files back over the new install to get your mods back.  It's a little work but  
you will now have a complete set of un-modded files. 
I think the tool mentioned above was the one I played around w/ a couple years back, it worked okay.