No OS files found on Disk.

Corrupt Master File Table. Please help

I hope someone can help. Last week I had to do a start up repair after new Memory corrupted the Start up. Now after a cooler install I cant even do a startup repair. The Diagnostics say

Root Cause found

No OS files found on Disk.
repair action - Partition Table Repair
Result: failed Error code = 0x3bc3

Edit
I cleared the CMOS and the recover worked upto a point. Now I have a corrupted Master File Table - Chkdsk aborts after about 20mins.
Is there a way around this.
Note - My harddrive is not backed up and I cannot access it to back up the data. If Vista it is saying not accessible and shows the harddrive is blank.

This is my Data Disk not my OS disk That finnaly works.

Please tell me there is a way around this and I dont have to wipe my hard drive which isnt backed up.


I hope you can help

Thanks Del

Just wanted to add - I had to recover the disk with a software program. GetDataBack which recovered 430GB - It took about 8 hours but well worth it.