Following a computer crash I've lost the functionality of Aero on my system. I am also receiving error messages relating to the vaultcli.dll and UXInit.dll files. I'm not sure what caused the crash as I was away from the computer when it happened. This is an odd occurrence because I've run Windows 7 64-bit on my system with no problems since installation in November. I tried to do a repair install but I also receive a gameux.dll error when the set up process is underway. Any thoughts or insight will be appreciated.