I'm having a really big problem with my PC, and I need some help urgently. Ok, up until today, all three of my USB slots have worked fine. But today, when I plugged my controller into one of the slots nothing happened and the controller wasn't detected. Then I tried plugging my USB Pen Drive in and it wasn't detected. I knew something was wrong so I tried my other two USB slots, and both of them don't detect anything. I've tried restarting and the problem hasn't gone away. I've tried doing a complete system restore to the system I was using that worked yesterday, and this didn't work either. I've tried looking around the internet and I've seen nothing about this problem anywhere. I need help with this urgently, as I am using my USB slots constantly and can't do anything without them. What can be done to try and solve this problem. Thanks in advance.