I'm sorry, it's next to impossible to discover what's happened to your files remotely. You'll need someone who knows to look at your computer.
It's possible that you archived the files into a RAR archive, if you were messing around with WinRAR.
A RAR file is basically a way of compressing lots of other files into one file, so it can easily be sent to someone.
So for example, you might have had 100 image files, selected them all and then added them to a RAR archive.
Check your computer for files with a .rar (dot RAR) file extension and then double-click on them to see if they contain any of your work.
Use the search tool in Windows XP or Windows Vista, you are basically search for files then end with .rar
Also, if you know what format your pictures were store in, then use the search facility to search for them also.
In Windows XP, you just click on Start and then Search.
Click on Pictures, Music or Video
Then click Search
It should search your entire computer for any pictures. Hopefully you'll find them.
For searching for the RAR files, do the same but in Search choose
All files and folders
Then in the "All or part of file name", type *.rar (star dot RAR)
Then click Search.
This will search all of your computer for RAR archives.
I hope you find them.