[Venkatesh]

The first thing I would try would be to boot with the recovery CD, but instead of letting the CD fully boot, hold down on F8 while the CD is starting. If the CD is based on some iteration of DOS, it will give you an option for "Safe Mode Command Prompt". This will give you a good old DOS prompt. Most system recovery CDs I have used (IBM and HP) have fdisk on the CD-ROM. I would then type "fdisk /status". This will tell you if DOS can see the hard drive and its partitions. After that, a good "fdisk /mbr" will remove GRUB (if thats what you want).

If the CD is not MS-DOS based, a Windows 95 or Windows 98 install cd will suffice for DOS.

Also you might want to try the GRUB command line. At the grub screen press C. Then you will get a prompt "grub>". At that prompt, type root (hd0,x), where x is the numerical partition on which Windows/DOS is installed. Then type "chainloader +1" and then type boot. You can find the number x thru experimentation or from a partition manager.

Good luck, and PM me if you need any help.