OT - OS Problems
UAC = User Account Control
It's designed to prevent changes to your computer's files without your knowing that they are being changed. Most power users found it to be more of an annoyance than a protection, and typically turned it off.
If you're talking about the keyboard shortcuts ctrl+c and ctrl+v, I have recently learned that it can get turned off on some systems. When I checked by right clicking and then using the copy / paste selections the clipboard function was still working so I figured out that it was just the keyboard mapping that had gotten messed up. Is the clipboard working at all? If not, then the OS install will need to be repaired. Do a Google search for the issue, as there may be several possible solutions to your problem.