All the help threads say that it's an error with the seatbelt.kext not matching up with the darwin kernel. I've tried fixing this issue over and over by installing the seatbelt.kext that matches up with my kernel. (seatbelt.kext kernel for 10.5.7). I'm running iAtkos v7 (Mac OS X 10.5.7 updated to 10.5.8). Everything runs perfectly except that I'm unable to install .dmg files because there's a kernel panic every time I try.

Here's a picture of the kernel panic: