Windows Authentication

I just installed Windows 7 back onto my laptop after having to replace the hard drive, but I can’t authenticate it because the serial on my computer is unreadable. Any suggestions on how to bypass this problem?
Answer #1
Just use Daz Loader:
http://www.google.com?t=9832521&highlight=
Answer #2
1st Step:
Download And Install Windows Loader x86(32bit)/x64(64bit)
http://forums.mydigitallife.info/threads/24901-Windows-Loader-Current-release-information
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2nd Step:
Validate Windows (Use Internet Explorer)
http://www.microsoft.com/genuine/validate/
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3rd Step:
Restart Your PC