Usb, touchpad and keyboard disabled suddenly.

Hello.
I have a notebook Acer E531 running Win 7.
Suddenly all my usb devices, touchpad and even keyboard happened to be disabled. If I run into safe mode they are still not working so I simply cannot unlock them... I scanned for viruses using AVG Rescue CD updated and Bitdefender which for some reason didn't update but they didn't find any viruses. I don't know how to enable the devices because I cannot access device manager in any way . Usb keyboard/mouse aren't working. I tried them in Linux (Unutu livecd and they work there). The touchpad isn't effected by the fn on/off command on the keyboard. I don't want to use system recovery but find another easier way. Any ideas?

Yes I can use it. I didn't tried does usb devices work then but usb mouse works in Ubuntu and so is the keyboard. I believe it is a very good virus attack because the client said there were some error messages poping up before this happened. Now it loads Win 7 fine and don't show any virus behavior like ads and slowdowns but I cannot do anything just shutting it down .

In ubuntu(linux) only. Not in Win7 so it must be software/driver issue. The problem is how can I enable them if I cannot access device manager even from safe mode.

benjy I said even in the original post that usb devices are working fine in another operating system. But Win 7 for some reason disabled them - possibly virus attack and I cannot open anything from Windows to fix the problem.