Multiple corrupt .bkf files.

Hello people. I'm having a serious problem here.

I have some .bkf files which contain very crucial data. They are stored in my external hard drive. Now the problem is, I can't restore any thing from them. If I try to restore any thing, I'm getting this: "Backup Exec 11d e000fe36- Corrupt data encountered". Some of the .bkf files are split into multiple parts. I need something that can help me recover my data from those files. I'm completely new in this.

I'm using Backup Exec 11d on Windows 7.

Please help me people.