Regular mode boot failure after upgrading from Win XP Home, sp2 to Win XP Home, sp3

When I install SP3, the machine will only boot in safe mode.  It boots well, when I do the built in recovery included with the "F10" key at the time of booting.    I have tried using a drive update routine.  That seems to have no effect, though some drivers continue to show as out of date.  I have read some about boot problems coming from installing the wrong version of .netFramework.  The recovered machine show the .netFramework as version 2.2.  I have read some commentaries on upgrading problems.  I am now convinced that my problem is related to the .netframework upgrade.  

I need to know how to install the upgrade safely without causing the regular boot mode to fail.  I am somewhat of the opinion that if I can get a good working version of Windows Installer 3 plus and use it to install my .netFramework upgrade, I think I can get the machine fixed.  I wonder if you can help me identify a valid source for Windows Installer versions so i can proceed to see if the .netframwork can be installed and return return the system to being an S3 machine.

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Gary CaseRetiredCommented:
Do you have an image of the OS from before you tried the upgrade, so you can restore it to its good, working condition before we work on getting SP3 installed?

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this method always worked for me; i made an install cd with sp3 slipstreamed :
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