hi there
this is a common problem and seems to be a problem within windows... however my first recommendaton would be a pretty simple one... try running a system restore to a point before you started decorating ( since it was obviously working ok then )
i wouldnt normally recommend a system restore however this is a situation were this could actually work since during a "system restore " windows will reload previous settings which are working ok and in theory your usb devices should work ok
i presume you moved your pc when decorating.. so you may also want to physically inspect the whole computer and check for any loose wires or connections .... you should also check for any damage to usb ports such as bent connectors.....
another quick fix is to change around the way your usb devices are plugged in... sometimes something as simple as this can actually work... one of my many pc,s wont boot unless i remove any external hard drives or memory sticks... and the other will only boot when the mouse and keyboard are plugged in specific usb ports
its also a concern to discover your touchscreen is also not working.... which says to me something happened when you moved the pc during decorating ......
so if the above does not work then it does look like a trip to the local pc technician... or if your pc is still under warranty return it back under the warranty......
so in summary... check all the pc for any loose connections or wires and use a low powered vaccum to clean any dust and dirt ....and try a system restore if possible
i hope this helps,any questions let me know
good luck !