My computer was previously loaded with Windows Vista and now I have recently upgraded to Windows 7. But, the computer does not shut down after upgrading to Windows 7. Sometimes I get an error-screen and many a times the screen turns black. Many of the times the desktop freezes and some times on shut down, it gives me an option to start Windows in safe mode. I cannot understand why this is happening? Due to all these problems I have to turn the switch off the computer by directly disconnecting the power supply.
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