Can Windows 7 be restored to the original Registry settings

I've made changes to my registry and no longer have the original backup.  Is it possible to restore Win7 to the original installation, without losing programs already installed?
J.R. SitmanIT DirectorAsked:
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Larry LarmeuPrincipal ConsultantCommented:
http://www.sevenforums.com/tutorials/700-system-restore.html

Go back to the date when you first installed the OS.
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J.R. SitmanIT DirectorAuthor Commented:
I furthest it shows is 1/24/2012.  OS was installed before that.  How can I go further.
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Larry LarmeuPrincipal ConsultantCommented:
You probably had too much data and it was pruning.

sounds like best way to go is to do a Windows 7 repair install.
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J.R. SitmanIT DirectorAuthor Commented:
How do I do a repair install?
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Larry LarmeuPrincipal ConsultantCommented:
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J.R. SitmanIT DirectorAuthor Commented:
thanks
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