Critical error, please help.

I just downloaded a trial of parallels desktop on to my mac. I have 10.5.8. I tried to use my bootcamp, went through the installation process and everything, and I continually get a critical error. It just says to contact support. I tried it with chrome os too, and get the same error message. I'm not sure how to get my boot camp to work with parallels, so any help would be appreciated. Thanks.