Problem

Recently i downloaded the trial version of windows blinds. At first it was really cool and i was going to buy the full version. Afteri turned off my computer and turned it back on with the skin on my whole computer was completely messed up. It was running very slow, the task bar was black and not showing. Anything i cliked would respond a minute later. I had to slowly go and uninstall the program. I tried to reinstall it but the same thing happened. I would really like to buy program but i cant with this problem