Troubleshooting im new help me!!!

im new help me!!!

thx!!! i bought sims 2 today...254 MB, everything else mets fine...i had a 256 game loaded worked fine...uninstalled it to load sims 2...now i can only get to disk 3 and it seems to stop...i see all the lights flickering but it has frozen up 2 times out of 5 try's....any suggestions??? i cant get on the internet because the puter is in my room, and my 3 yr old plays games on it....sorry