i am running mac osx 10.6.6 on a unibody macbook pro. wierd things started to happen such as disk utility not opening and me not being able to open the accounts preference pane. i decided to wipe my hard drive and reinstall snow leopard. i saved things i needed onto an external hard drive. when i put in the install dvd, it said osx cannot be installed on this computer and quit. i will include screenshots. what should i do to fix this so that i can return my computer to factory settings?