Sims 2 discs not reading



I have been able to install the sims 2 base program it took me about three days to figure out the original problem now I have the same problem with the Expansion packs and have tried everything that I did with the base to get it to run. Here’s the problem:

When I insert the disc It will read and acknowledge the existence of the disc in the drive but the autorun will not load to install the games. So I will go into the disc contents and try to run the autorun from there and same thing the computer will start to read the disc then stop… no error messages or any thing to saythst it’s stopped doing anything just that the “thinking” cursor will dissapeat and be replaced by the standard pointer. I have tried to run as admin also same result, cleaned the registery and such but nothing…

I an running on vista.

any ideas?