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CheckSUR file - CBS MUM Corrupt 0x800F0900

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Hi - am new to the forum and am also not very technical but wondered if someone can help. I have two problems with my son's laptop running Windows 7 Home Premium 64 bit and not sure if they are both related. 1. After installing some updates yesterday - he is no longer able to log on as his user - it brings up an error - "unabled to access Group Policy..." and then logs him off. I can log...

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