problem drawing in tbs 5

Ok, I have used tds 4 previously but i just bought a second hand lap top that came complete with tbs 5.
It seems 2 have a problem. When I draw, as soon as i press the tablet pen down when using the brush tool the drawing area goes black, same thing happens with shape tools. If i change to the pencil the screen dosent go black but nothing shows up that i draw until i take the pen off the tablet.

Any help would be great.

Cheers guys and gals