Since there are 686 models of the Toshiba Satellite series, it would be helpful to know which one.
You can also help us in diagnosing your system if you download and install the free Belarc Advisor, Everest Home, or CPU-Z/ CPUID... which inventory your system thoroughly, or run Start->Run-> then type Cmd <enter>, and type dxdiag <enter> which gives you a much less useful, but still helpful, inventory... if you use WXP