how to change my bios

[irishmary]

hi can anyone help
i've messed about and had to install vista again when i choose the partition it says
''this computer's bios do not support this disk, enable in bios''
i've tried but can't seem to do it !
i messed about with system restore i think i disabled it there

[soybean]

i've messed about

More details on the "messing" would be helpful.  Was Vista running OK on that computer before you "messed about"?

enable in bios''
i've tried but can't seem to do it !

Did you access the BIOS?  Do you know how to do that?  How do you?

i messed about with system restore i think i disabled it there

That really doesn't make sense.  You wouldn't disable a disk by using System Restore. 

[irishmary]

vista was fine until it said i had 2 files named c did i want to rename it i clicked yes,coul'nt get xp my main os to boot.so i tried to repair with xp disk,not really knowing what i was doing i disabled something called bootcfg ,also i press f2 to get into bios at start up,now i try fresh install with xp it gets so far needs to reboot ,when pc starts set up starts from scratch,thank's for help

[soybean]

So, you have a dual-boot configuration with Win XP and Win Vista.  Right?  Who set that up in the first place? 

Do you have a CD for both OS?

[irishmary]

i set it up ran great until it asked to change name of c drive.yes i have both xp and vista ultimate disks

[Trinox]

What kind of computer do you have?

[irishmary]

my pc has conroe xfire,intel duo core,1gig ram,2x 150 hard drives

[Trinox]

Unplug your main power supply cord that's supplying your PC with electricity. Wait 10 minutes or more, then replug and reboot your PC.