Black screen upon startup, wont run?

Hello,
i recently purchased a dell inspiron 1545 around 2-3 months ago it is a windows vista laptop
yesterday i switched the laptop of as normal & when i went to switch it back on it done the following :

*DELL logo and a loding bar with inspiron underneath then at the right corner F2 Setup F12 Boot
*it then goes onto a black screan with white writeing saying

Windows Failed to start.A recent hardware or software change might be the cause.

If windows files have been damagd pr configured incorrectly,Startup repair can help diagnose & fix the probolem.If power was interupted during startup,choose windows normally.
(use the arrow keys to choose ure choise)
*Launch Startup Repair (Recomended)
*Start Windows Normally

Seconds untill the highlighted choice will be selected automaticly:number counting down))
Description:tells what ;aunch repaor & start windows normally does

*(when i click either choice it comes up a loding bar with Windows coarparation underneath

*after that it comes up a black screen for about:10 minutes

*then it goes onto a blue screen saying:

STOP: c0000135 {Unable To Locate Component}
This application has failed to start because KERNEL32.dll was not found. Re-inst alling the application may fix this problem