DELL inspiron N5050 Series Window 7 Installation boot time blu screen Error Soltution

I finally got the solution for this problem:

1. Insert Windows 7 DVD and boot from it
2. in the first screen choose your language and proceed to the next screen and choose "Repair your Computer

•    Press Shift+F10 to open Command Prompt

then type following commands

1. c:
2. bootrec /FixMbr
3. bootrec /FixBoot
4. bootrec /RebuildBcd
5. exit

restart the system and it worked like normal.