there are free tools out there which will allow you to do this.

Not used this myself, but it seems to fit the bill:
http://www.pcinspector.de/file_recovery/uk/welcome.htm

BUT... you should not use the computer at all really. Should not copy anything to the drive that your trying to recover data from. Or you will serious lessen the chances of being able to recover it.
When u delete something, it is not really deleted. Just marked as available space. But if you continue using the computer / saving stuff. Then it really will be overwritten.

ste