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#11
Please zip up and upload the contents of C:\Windows\Minidump with your next post.
Please uninstall the Norton as described above. Feel free to reinstall it after we're done troubleshooting.
The fact that you had Vista (and had BSOD's there also) suggests either a virus infection or a hardware problem.
Please run one of these free, independent anti-virus scans: Free Online AntiMalware Resources
Then start on these free diagnostics: Hardware Diags