Alternatives to Deep Freeze?

Dude604, like the above users have mentioned, have your PC protected with user access control and administrative rights. However if you are looking for a solution that not only protects you from your kids messing around but also gives you an option for disaster recovery incase you have done something wrong in the system by installing a malicious program or having deleted something accidently or if your system all of a sudden one day things not to function for some reason, use a disaster recovery solution like RollBack Rx. Some would say imaging, but according to me Imaging takes a lot of time and space where as this snapshot technology used by RollBack Rx is impressive. Give it a shot, it might sort it out for you.