windows failed to start. a recent hardware or software change might be the cause. to

hi everyone i am facing the below issue and want immediate solution.
my laptop details:

dell studio 1435

when i am formating my laptop with windows7 usb drive it completed 85% and after that i am geeting the below error:
windows boot manager

windows failed to start. A recent hardware or software change might be the cause. to fix problem:
1. insert your windows installation disc and restart your computer.
2. choose your language settings, and then click "next."
3.click "repair your computer."


if you do not have this disc, contact your system administrator or computer manufacturer for assistance.


status: 0xc000000f


info:A required device is not connected or can not be accessed.

Enter: Os selection

when i click on enter it go to another window where it shows us to press F8 but when i m pressing f8 it goes to same error window.

1) when i restarted it start with dell logo i press F2,F12,F10 all three i have press to open bios setting but nothing works it will go to same window so now i a not able to get into windows bios setup

2) i tried to format it again as my dvd writer does not work so i tried with usb when i restarted my laptop it does not load the files and agin redirect to the same error window.


so i have tried all these things to solve the problem but nothing works:(

please help me to solve the problem.Thanks in advance :)