There are plenty of file recovery tools. You could ask google for things like "undelete" or "recover files windows" and with a bit of luck, some time and the right tool, you can recover at least a previous version of your source.
For example the "tuneup utitilities" have a 30day trial and contain undelete tools. Maybe you want to try that as most dedicated recovery tool trials don't allow you to save the data during trial, but tuneup might.
If you are very serious about getting the file back, you would not ever start the installation again (risk of overwriting data you want to recover) and only work on a 1:1 image copy you create right after it happened. If it was a faulty suspend mode (incompatible/faulty drivers or hardware), you might find your source in the memory dump windows created on the hard disk. Make a copy, open it with a hex editor and search for a unique string in your source.
You might only get an older version back though, or 90% of your file.
ps: obviously if you install the recovery tools on the same partition/system where you want to undelete data from, you might overwrite the data with that installation