windows 7 dell optiplex 755 boot fail

Hi please help i have got a dell OptiPlex 755 (discontinued model)

i boot up that takes a bit longer than normal then it goes to the windows 7 logo twirly thing it pauses half way through a flash of blue screen (too short to get a code) then it restarts i can then go to the option to start up recovery or start normally i go to recovery it scans my system wants to send something to Microsoft. i have also tried boot rec.exe that didn’t work

i have just got hold of windows vista and xp instillation disk i am going to try that.

Please help

Also see my vid of what it does http://www.youtube.com/watch?v=KJ6rwHmGNhk

Thank you

You could download the appropriate .iso file, burn it to disc, and then try to repair your computer.

Official Windows 7 SP1 ISO from Digital River « My Digital Life

Hii thanks for the quick reply just thinking what that file is shurly that's the same as what u can get up you know cmd prompt win recovery image windows memory diagnostic tool and all that if not then let me know

Solveeeeeeddddddddd

My hard drive was kicked to the bottom of the boot List fixed now thanks for you help