ITunes Won't Run - Tried MANY Recommended "Fixes"

I cannot open iTunes. I get a brief hourglass cursor and then nothing (no error message either). I can see iTunes.exe in the processes list. I CAN open quicktime. I have no Norton or MacAffee products installed. I wiped and reinstalled iTunes and Quicktime. I followed instructions from apple support and turned off all background programs with MSCONFIG with no result (http://docs.info.apple.com/article.html?artnum=302856) . I tried to resolve digital signing issues by reregistering the .dll's (http://support.microsoft.com/kb/813442)
I CAN open iTunes if I sign in as another user, but I want to resolve this problem rather than switch to a new user.
I recently got an external hard drive and set up another iTunes library there, but have had no problems in the last few days I've been using it.
I've run several antispyware programs and scanned the drive for viruses.
Anyone have any more ideas?
Inspiron E5105 Windows XP
ETA: It now appears that ONE problem is that when I reinstall iTunes it does not install Quicktime (even though I am TOLD both installed correctly). The reason I get this impression is that I get a message that I know is consistent with not having QT installed: "iTunes has encountered a problem and needs to close We are sorry for the inconvenience." When I get the standalone QT installer, this message does not reappear. However, the above problem remains...

good lord. okay, we're in the realms of basic/general principles troubleshooting now.
let's check to see if this is a systemwide thing, or if it is associated with a specific XP user account. (i don't usually associate User-Account-Specific issues with error-message-free launch failures, but we've been coming up negative on all the standard causes of those issues.)
let's try an experiment.
head into your user accounts control panel and create a new user account with full administrative rights. (there's help documentation on how to do that at the left of the control panel screen.) while you're in that control panel, switch off "fast user switching" in your logging-on preferences.
now log out of the old account and log into the new account.
does itunes launch properly from inside the new account?

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follow this link for more info. http://support.apple.com/kb/HT1923
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well done uproom_stares!
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Hello sphsphsph,
Welcome to the Apple Support Communities. You may need to reinstall iTunes, the following link will assist with downloading the latest version of iTunes and then run the installer.
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http://www.apple.com/itunes/download/
Regards,
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ITunes Won't Run - Tried MANY Recommended "Fixes"

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