If you pressed Shift + Del - sorry, they've gone. Widow's erased all records of them. The file is still there, waiting to be overwritten (Widow's has declared the space the file occupied on the hard drive as available) but you need special software to recover them.
Your IT Manager should have a backup if the manager's computer is connected to the company server. He should be able to re-install them.
If not - sorry funkylad, you're screwed. Best start making up some viable excuses or start looking in Jobs Vacant.