Vista - Windows Vista Installation Problem

I get this error:

Windows failed to start a recent hardware or software change might be the cause. To fix the problem:
1. Insert your windows installation disc and restart your computer.
2. choose your language settings and then click "Next".
3. Click "Repair your computer"
If you do not have this disc, contact your system administrator
or computer manufacturer
file: \windows\system32\drivers\iastorv.sys
Status: 0xc0000098
info: Windows failed to load because a critical system driver is missing, or corrupt

Here are my System Specs.

e8400 C2D @ 4.05ghz
Gigabyte EP45-UD3R
WDC 250gb HD IDE
Windows XP Pro 32bit.

run system file checker from a dos prompt as follows:

sfc(space)/scannow
sfc(space)/fix

It checked the Win XP Disc
And after that nothing happened
I did the /fix and nothing happened as well.

dont use the "run" command. open a dos window (command prompt)

Same thing happened.
It checked my WIN XP CD and then When I did the Fix thing it said it wasnt a Command and it gave me a list of the commands I could use.

you have to boot with the cd,when you get the command prompt, you have to switch to the C: drive. the command is CD\ C:
your new command line should now start with C:
now run sfc as before.
the way you were running it, sfc was checking the files on your cd drive.

It's not doing anything.
Just giving me the / commands again.
How excactly am I supposed to type it?

try this first. let me know what happens.

Startup Repair: frequently asked questions - Windows Vista Help