I researched again and found this website: http://securityrespo...valinstructions
And I don't know what I did but after I removed the last registry key listed at the bottom of the page, my windows xp went funny. The task bar has now changed colour to white instead of green and blue, the windows that open are different.
My sound has gone and when I go into Control Panel/Sounds, Speech, and Audio Devices and click Sounds and Audio devices, everything is grey and not accessible.
Also all the internet connections I've made have disappeared from the Network Connections folder.
I don't know what else might have gone wrong, but system restore doesn't work and is there anything I can do to fix things to how it was?