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How do I completly erase hard drive? How do I reinstall windows 7 from orininal back-up DVD and will that reboot the system? I changed the windows 7 default browser to 64-bit in a praogram window trying to solve these issues and do not remmber how I did it. Could you explain that to me? So I can change after the reinstall becouse it will go back to the 32-bit defoult and I want the 64-bit ie8. I have windows 7 Home Premium os and ie8 with google as my search engine. My laptop is a Toshiba Satellite P770-ST4N01

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Page 76 of the User Manual has instructions how to Restoring from recovery DVD/Media. – CharlieRB Feb 27 '13 at 21:02
    
Why don't you just describe the problem you are trying to solve by reinstalling Windows 7 instead? – Ramhound Mar 1 '13 at 12:37

Just boot your computer with the DVD inserted.

This will show you a "Press any key to boot from cd or dvd" message: just press any key; this will start the windows installation.

When asked, choose "Custom installation", delete all partitions and recreate them.

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