Windows becomes unresponsive

I've got a computer running Vista home premium that was giving me issues with the cisco VPN client.  The system would give an error that it could not enable the virtual adapter.  So I checked the PC out and found that although it was set to install updates automatically, it was running with no service packs installed.  So I installed SP1 and that went okay.  Next I installed SP2 and that took a while and just about when I thought it was about to finish it stopped and gave an error that it could not install.  I rebooted and tried again and now it reports that I can't install SP2 because SP1 must be installed first.  So I download and install the MS System Update Readiness tool an it runs for hours and then completes and then I installed Sp2 successfully.  Now that I have that installed any time I try and install anything using the windows installer, the install hangs.  Running an msi or trying to install a windows update causes the updated to hang and takes explorer with it.  I've run chkdsk and sfc /scannow and they come up clean.  I tried running the onecare safety scanner but it won't run.  I've run the ccleaner registry repair and it didn't help...  Any suggestions?
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EshuunDaraAsked:
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EshuunDaraConnect With a Mentor Author Commented:
Found that if I disable all the fujitsu software that loads at startup, logging off goes smoothly.  Using secedit to reset the system's security back to the defaults fixed the rest.
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Donald StewartNetwork AdministratorCommented:
Reinstall "Windows Installer" and try again
 
http://support.microsoft.com/kb/942288 
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EshuunDaraAuthor Commented:
can't...  it won't let me reinstall - says the update does not apply (because it's already installed).
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EshuunDaraAuthor Commented:
okay, i ,managed to get onecare saftey scanner working, and it cleaned the registry up and now I have a different set of problems.  I can add/remove programs, however it takes FOREVER to log off and the control panel window freezes when I access certain applets (such as Network).
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