[Answering to the question in the discussion in the comment to the question:]
You certainly need much better Revision Control system. Actually, if you are not using a decent system of this type, you are not really developing, you are risking all your valuable development asserts to be lost or just buried under the tons of back-ups, which could practically be almost equivalent to final loss.
Please see this discussion, including my answer:
Revision control systems, which to choose from?[
^].
In this past answer I explain why not VSS, in particular:
How can i structured to arrange source code when i create a new solution[
^].
Actually, my favorite so far is Subversion:
http://en.wikipedia.org/wiki/Subversion_%28software%29[
^],
http://subversion.apache.org/[
^].
You can see some detail I explained in this answers:
Needs some words of wisedom to set up and/or use a server[
^],
Make an unclickable form[
^].
—SA