I have managed to fix it. What had happened was...
I installed a new theme from the internet (bad idea) and I didnt like it. When I switched back to the windows classic theme, some nasty bit of code changed all my text,backgrounds, menus,start menu etc etc black! All i could see were icons. To fix it, i did this...
1.right click
2.press up arrow once
3.press enter
4.click around the area of the fourth tab (appearance)(guessing as you cant see anything at all!)
5.when the first tab is activated, press tab once to highlight the colour scheme selector
6.press down to choose a colour scheme
7. press tab 6 times to highlight apply and press enter
8. PHEW!
Whoever coded that little thing needs shooting as it just isnt funny.