How do I undelete accidentally deleted files?

[aliboo13]

The other day my younger sister got a windows XP alert pop-up telling her that the computer was almost out of disk space. It suggested she perform disk cleanup to free up space. She did this and deleted a bunch of stuff that shouldn't have been deleted (Internet Explorer, ActiveShield, Microsoft games, and others). I tried to perform a system restore to a date before she made these changes but all the system restore dates before the unwanted changes had been deleted as well.  

Is there anyway to recover or undelete what was lost during the disk cleanup? Or at least is there a way to find out exactly what was deleted so I would know what had to be replaced or reinstalled?

Thanks to anyone who can help

[Peccavi]

Try Easy Recovery.

[patio]

You can also try running sfc /scannow which will check XP system files and replace them if they are missing or corrupt...have your XP CD handy as it might request it.

patio.  B)

[GX1_Man]

Do you have a legal Windows CD to reinstall when you need to?