i recently wanted to use Parallels Desktop 5 for Mac but i did have problems because it does say that my processor does not support virtualisation, trouble that i did not have at version number 4 of the same software, so the trick was to use Pacifist 2.6.3 that is compatible with Mac OS X 10.6 “Snow Leopard”.
Pacifist 2.6.3 is a shareware application that opens Mac OS X .pkg package files, .dmg disk images, and .zip, .tar, .tar.gz, .tar.bz2, and .xar file archives and allows you to extract individual files and folders out of them. This is useful, for instance, if an application which is installed by the operating system becomes damaged and needs to be reinstalled without the hassle of reinstalling all of Mac OS X. Pacifist is also able to verify existing installations and find missing or altered files*, and Pacifist can also examine the kernel extensions installed in your system to let you see what installer installed them, and whether the installer was made by Apple or a third-party.