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If you work through all of the suggestions and its not improved you can reinstall but this time wipe the HD of all code first since boot code can sometimes interfere. Disk - Clean and Clean All with Diskpart Command - Windows 7 Help Forums Make sure no other HD's are plugged in.
This is especially important if you only formatted the HD and didn't correctly delete all partitions. The old partition table is still there as well as boot code from all previous OS's.