My system freezes during the install

There are a couple things I know can cause this on some chipsets. If you have more than 2 Gigs of RAM you may randomly get a crash during the install process. You can remove some of your RAM or try the bootflag

maxmem=2048 

at the Darwin prompt.
Another thing that can cause this is a bad DVD, if you want to rule out the 2nd option let the installer run its disk verify.