Error 320 and 330 need help formatting vaio laptop

I have a sony vaio model PCG-5K7P built in with Windows Vista Home Premium OEMAct 32bit
I was having problems with my laptop starting (specific problem was that after loading past the welcome screen only a black screen with the pointer was visible so i opted using Sony Vaio's inbuilt recovery system that allows you to restore the C: drive to its factory settings.)
At around 47% the process stopped and then errors 320 and 330 were shown.
After restarting my laptop this message was shown:

"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 for assistance.

File: \Windows\system32\winload.exe

status: 0xc000000f

Info: the selected entry could not be loaded because the application is missing or corrupt"

So what should I do to fix this?
Also I'd like to know as well how I can downgrade my laptop to windows xp provided that it isnt a tedious process since I don't know much about this stuff. Otherwise, simply going back to windows vista home premium would suffice.

It seems your hard drive has gone. Does it stop at formatting, or restoring the OS and software?

Cheers,
Josh

If you do replace the hard drive, you can get a legal copy of a Vista install ISO as follows:

Post here and ask Peter (Ex_Brit) to send you the link to the versions of Vista you need, 32 or 64. Include your E-mail address mucked up, like abc at xyz DOT com then edit your post and remove it as soon as you receive the link.

The ISO Peter provides has both SP1 and SP2 applied.

You can then use the iso to burn a install DVD or create a install flash drive.

Pick up the Tutorial: How to Download a Vista ISO and Create an Installation DVD or USB here:

STEP THREE
To Create Vista Installation DVD or USB Flash Drive with ISO File

During the install, when asked for the key, don't enter it. You will then be given a menu where you can chose the version you want to install.

Activate once the install is completed.