Up until a month ago I seemed to have full access to my system. Seemingly out of the blue I was unable to run Skype or Google Chrome, so I removed and then reinstalled them. Windows would not allow me to open the downloaded file and on following various threads found I had issues with my rights as administrator. I am now unable to access User Profiles in the Control Panel to change details as well as adjust my UAC. Now areas in my Control Panel and User Settings have the UAC Shield next to them and do not even respond, and yes I have tried to access my UAC but this will not open. Have also tried a variety of cmd prompts that come up in a system 5 error, have tried to open in safe mode, and have also tried to reboot to an earlier date, none have worked!