I just installed Windows 7 RC and forgot to save a few important files that were in Ubuntu 9.04. I did not have Ubuntu installed on a separate partition. I just used the install inside Windows option. Is there anyway I can still recover my files?
Looks as though you had Ubuntu installed so that it used a flat file (C:\ubuntu\ubuntu.disk) as its filesystem.
If it was still around, you could boot up Linux using a Live CD of Ubuntu, mount that image and then proceed to copy things from it without a problem.
But, you deleted it. The data is gone and probably unrecoverable since you said you deleted it to make room for other things.
Unless you had another .disk file sitting somewhere that Ubuntu was storing data on, you're out of luck.