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UAC prevents explorer.exe from running on startup

UAC prevents explorer.exe from running on startup

UAC prevents explorer.exe from running on startup

After running AVG Tune up (coincidence?) unable to get to Win7 desktop. "Explorer.exe Application Error. Application unable to start correctly 0xc0000022" In Safe Mode turned off UAC (User Account Control) and the system booted fine into normal mode. What do I need to do to fix UAC so I can turn it back on without running into the Explorer.exe application error on startup? Thanks in advance for you help!

RE: UAC prevents explorer.exe from running on startup

2. System Restore back to before running AVG TuneUp
3. Could be a hardware problem - check hard drive and memory

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