It's more than just a few files, registry entries are made as well, with any program installation.
If you can prove you bought a copy, you can probably get replacement CDs for $20 or so. Might also want to check eBay, since you might be able to buy a whole new copy for less than that.
I installed the program quickbooks on my computer and i cant find the cd anwhere. I need to reformat my hard drive because of registry problems that cant be fixed. Is there anyway i can copy the quickbook files from my computer and then paste them back on my Hard drive. For exmaple, move the program over to the D drive, and then when i reformat the C drive, copy it into that. Any help wouldbe appreciated.