a disk error has occured. . . press ctrl+alt+del to restart

also i had vista origenally then my pc stoped booting correctly also befor this happend the first 2 crashes i was able to fix my pc when bios started by hiting f11 and there was an application that could restor it completly then i made a back up disk for the stuff i had and i still have and the 3rd time it didnt work i couldnt restore it any longer i tryed f11 mutipule times so i installed an os my brother had and i worked but it didnt have the code so had 30 day trials of windows 7 then i came acrost a program that removed the registry for the os (it wasnt a trial any more) the pc worked for 3 and half months then the current problem came along and here we are

If you don't have Win7 or don't want to buy Win7 then what I would do is wipe the HD with Diskpart Clean Command and reinstall the licensed version of Vista, using its installer which you create following the steps given here: Vista ISO download

After compiling the Vista ISO burn to DVD using ImgBurn at 4x speed, boot and follow these same basic steps to Clean Install Windows 7.

If it fails post back exactly at which step and the verbatim error message.

lastly i got the upgrade thinking i could install it again so i was going to ask my bro for his os but he some how lost it. if he hadnt have lossed i would have installed it again and did the upgrade

Did you buy a Win7 upgrade version to use on this computer? If so boot it to Clean Install Windows 7.

If it fails, reboot into the DVD, press Shift + F10 at the first screen to open a Command Line, run Diskpart Clean Command then try the install again.

If that fails post back the exact step where it fails in Clean Install Windows 7 and the verbatim error message.

If you don't have a legit Win7 Upgrade DVD with Product key then reinstall Vista as I suggested in my last post. If you have the Product Key but no DVD we can provide it for you.

i went and tryed clean all and it says "diskpart has encountered an error: the semaphore timeout period has expired. se the system event log for more information."

Just do the Clean command, from the installer's Command Line accessing DISKPART At PC Startup

i hit clean and it almost imedately said "diskpart succeeded in cleaning the disk"

This is correct. Now try the install following the steps in Clean Install Windows 7.

While it is installing read over these Best Practices for handling drivers and setup in Clean Reinstall - Factory OEM Windows 7 so you get and keep a perfect reinstall.

um my bios says harddisk failure is imanint please back up your memory or someinthing like that and it gave me 2 options first was setup and 2nd is continue

Time to purchase a new one.