Itunes will not load due to An unknown error has occurred (-42408).

in Windows iTunes will load but fails every time with "An unknown error has occurred (-42408)."  There is no obvious way to uninstall iTunes.  This includes manually starting iTunes from the Start menu and pluggin in an iPad2.
How can iTunes be uninstalled/reinstalled or fixed?

I just finished a re-install of iTunes 10.6.3.25 which worked fine.  I am using Windows Vista.  I logged off the Admin account and logged into a user account.  I plugged in the iPad2 and it never got to the sync that normally happens automatically.  then I got the -42408 error followed by another error:  iTunes cannot read the contents of the iPad "iPad".  Go to the Summary tab in the iPad preferences and click Restore to restore this iPad to factory settings.
If I do this, will I lose all the Apps that were purchased?  Or will I need to re-download them?  But most importantly, will doing this Restore fix the problem?
Thanks in advance for any ideas or proven solutions!

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