As you have mentioned your issue related to operating system Windows Vista that some of the system files have been corrupted so it will be better to you to reinstall Windows Vista.
but there problem is that you are not a technician so how it is possible to install vista, but you know that nothing is impossible, since men made each and everything possible.
but for more you can visit. http://www.iyogi.co.uk
PRINCE
June 2009
According to me some of the bootable files in windows vista are corrupted.
You can repair these files in windows vista using " Recovery console " feature.
But to use this feature, you need bootable disk of windows vista .
This will solve your issue , still need any Technical assistance visit http://www.iyogi.co.uk/
Soloman vandy
June 2009
If you want to boot from the Installation CDROM disk you can set the machine up to do this... Lots of instructions on the web...
Power on and keep pressing Delete - will enter the BIOS screen - change Primary boot device to CDROM - insert CD power off and on again - at least that's how I did it with XP earlier this week...
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix desktop pcs.