Blue Screen Of Death (0X00000F4) when i try to boot or format my pc

Blue screen occurs whenever i try to boot my PC or try to format and install the OS.
i tried to recover the pc using system restore or the system restore drive in the PC but the same blue screen error occurs and my system crashes.

1. I was trying to defragment my registry (need to restart)
2. When the pc restarted the blure screen error poped when the starting windows logo was gone.
3. The blue screen error occurs only after the windows is loading logo or windows is starting logo is disappeared.

How do i format the hardrive and install the windows again.

i cant restore i cant format i can do nothing.

I am using windows 7 Ultimate RC official version.

Thank You

Thanks a lot, i had to backup all my data and format the pc