[Closed] PDF File Recovery

I've stupidly managed to delete some very important PDF files from my PC (running windows XP) Even more stupidly, I then also cleared the recycle bin.

I desperatly need to recover these files.

So far I've run;

Recuva
PC Inspector File Recovery
UnDelete Plus
Uneraser
File recover
Recover My Files
Active@ File recovery

The last one had a super scan option that took over two days to completely analyse the hard disk.

Although I have recovered huge amounts of stuff, some deleted a long time ago, these PDF files still aren't being found.

The PC hasn't been used (apart from running recovery software) since the files were deleted, so there has been no overwriting, formatting etc.

Please, does anyone have any advice on any software I could use, freeware or purchase! I need to get these files back.

Cheers