My computer freezes and then restarts itself (every few minutes). Tried System Restore but no good.

Have you tried using the MSI Live Update utility?
http://www.msi.com/service/download/

I was trying to download this for some time. I eventually managed it but every time I try to update my drivers (apparently they all need updating) the computer just crashes time after time. Any suggestions. Can it be done in safe mode because if so I can't seem to do it. Still all fine in safe mode

You would have to choose Safe Mode with networking, then try downloading the drivers

I have managed to get Live Update 5 on my desktop but when I open it in safe mode an error message comes up saying 'Driver can't Load!'. I also cannot access the internet in safe mode (but don't know if that's normal or not). Just in case it helps. Whilst in safe mode I did a virus check with malwarebytes and the system was apparently clean.

Try this XP repair:
http://www.michaelstevenstech.com/XPrepairinstall.htm

Hi again and thanks for the link. I have currently got the XP Professional disk in my PC, gone through the options and found that my partitioned space on the C drive does NOT have the option to press [R] to repair. Any ideas why this might be or what I could try next. On the link it does mention something about trying to repair on the initial menu but struggling with admin password as well as choosing which number to choose. Ta

Why don't you delete the Windows partition and start a fresh install of Windows. You can put that hard drive aside and install Windows fresh on another drive. Install the original drive as a second drive and recover any files that way

I'm thinking that I'll need a fresh install too. Will I need to buy a second hard drive then in order to do this (and keep anny my files)?

Yes, you will have to buy another hard drive if you don't have a spare drive handy. You will be able to save documents, pictures and music, but no program files unless the program install files are on the old drive

I am currently in the process of doing a clean install but whenever it gets to about 25 mins left it just restarts. Just then it restarted when I was trying to enter the product key. I guess this means something must be wrong with one of my components. Any ideas would be appreciated.

Memory or hard drive. How much memory and how many memory sticks are installed?

I think there is a 160gb hard drive and 1gb of RAM (2 sticks) I think. There are 4 memory stick slots to connect to the motherboard and I've changed the memory sticks into different slots and it made no change. The computer specs on control panel say 2gb of RAM so not sure of the disparity.

Disregard the above re disparity. I just re-checked one of my earlier posts and it says there is only 1Gb of RAM (two 512 sticks). Definately 160Gb hard drive and 1Gb RAM

Remove 1 stick of memory and try the install

Still nothing and I've changed the power supply and no change. Think it must be the motherboard

Did you do the memory things