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On my 32-bit Windows XP machine I accidentially imported a .reg file that contained the whole HKCR branch of a 64-bit Windows 2003, now I have my HKCR with lots of redundant and maybe even erroneous data.

The machine is still alive, but I don't know how long it lasts. I guess there's a backup somewhere done by Windows. How do I restore it?

I've found this guide, but it requires a start-up disk which is not very fortunate. Are there any other ways?

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System Restore ought to get you back to a point prior to this if you have not disabled it. Start>Programs>Accessories>System Tools>System Restore. I would recommend trying it from safemode if it does not run successfully from a normal windows session

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+1 This is the way to go. – KCotreau Jun 9 '11 at 13:10
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This only works if System Restore was enabled prior to the incident. – sharptooth Jun 9 '11 at 13:19
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you might note that system restore is off for you and an not an option. I did mention that it won't work in that case. – datatoo Jun 9 '11 at 13:22
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You can use a (free) Live CD of an GNU/Linux operating system, mount your Windows partition and follow that guide of yours (somewhat loosely though).

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