My ntfs maxtor hard drive D has automatically compressed some audio wav files,which became zero bytes.pls help

I have a 200gb maxtor ntfs second (D) hard drive which I was using to record and synk sound with the picture for professional Bollywood films. Nuendo 3 software I was using for my work.My windows xp professional operating system was installed on a seperate 40gb drive C.I used to open my working session from Nuendo and start my work and save this work session back to nuendo but now when I opened the same session in Nuendo 3 it shows many missing files.I have tries to resolve missing file issue by searching the relevent folders on the working hard drive but I could not resolve the missing file issue.When I opened the session folder on the same drive I found many audio wav files have changed their colour from black writing to blue and their property and size were also changed from original bytes to zero bytes but when I open their property by right clicking the wav files it says file size 0 Bytes and size on the disk original Mb.I found that these files have been automatically compressed.I went to their property and unchecked the compression from advance tab,clicked apply and Ok but these files do not turned into their original form.some of the files have changed their colour from blue to normal black but their property did not turned to original mb.They are still o bytes and some files even did not change their writing colour from blue to black,which means they did not accept uncompression command.I have also tried to uncompress all folders and sub folders through command prompt but it did not work on the sad audio files.same thing happened with some MPEG video files.Their property has changed from few hundres MB to 0Bytes.The total property of this hard drive is still the same which means these missing files are still laying somewhere on this hard drive. I have coppied the whole hard drive on to another new hard drive but the problem is still the same.Please help me to fix this proble as I said it is really important work which i can not afford to loose.I must tell you that I have also run so many hard disk recovery and repair softwares but they could not solve my problem.This hard drive is accessable and still working fine.Thank you for any possible help. KK