Windows XP forum: Recovering a Ctrl+z deleted file in Windows XP

Hello,

A several part question here, but all basically related to recovering lost files in Windows XP. So, first, the scenario. I was backing up some important Word documents from my computer onto a removable flash drive, as I do periodically. I was doing so by copying the file on my computer and pasting it over the older version of the file on the flash drive, switching back and forth from one window to another. In the process, I managed to lose track of which window was which and copied-pasted a few of the older versions of files on my flash drive over their updated counterparts on my computer. (Hence, my first question. Is their some way to retrieve those newer-version files that were pasted over?) I realized the mistake fairly quickly, and thought that the best way to fix the error would be to try an 'undo' command (via ctrl+z). A prompt box appeared and asked me if I wanted to delete the file that I had just pasted over. I didn't and clicked 'no'. I then thought about it. I already had the same older version of the file on my flash drive. It also seemed possible that the undo command needed to work through several steps to bring the old file back (delete the pasted version then un-delete the pasted-over version). I didn't see any risk, so I quickly hit Ctrl+z again and clicked yes to deleting the file ... just in about the time it took me to realize that the prompt box this time was asking me about deleting another file, which I had saved just previously. (It seems that Ctrl+z in a folder generates a delete prompt that cycles back chronologically through the things that have been worked on.) That file immediately disappeared from its folder and now can't be found with any searches. Nor was it sent to the Recycle bin, which was one of the first things that I checked. So, is there some way to recover that Ctrl+z deleted file? (It's rather an important one to me and I won't be able to reproduce some of the material that was in it.)

Help would be greatly appreciated.