UPDATE: So several minutes after trying to open POS, I noticed that it had showed up on the task bar. I clicked on it and was able to enter my login information, but as soon as I did it locked up. I decided to leave it alone and several minutes later it had logged in and was working normally. Then I closed it to see if it would open normally, but it's doing the same thing.
Anyone know what's going on and how to fix it?