Upgrade to 7.7 on Windows XP and can't open iTunes

I have uninstalled and reinstalled three times after upgrading to 7.7 so that I could activate my new iPhone. When I try to launch iTunes...nothing happens. I see that the exe is listed in task manager and if I delete it and try to run it again I get the following message.
The application or DLL C:\Windows\system32\cryptdlg.dll is not a valid Windows image. Please check this against your Windows installation.
HELP! I was on the phone with tech support for two hours without any resolution.

The application or DLL C:\Windows\system32\cryptdlg.dll is not a valid Windows image. Please check this against your Windows installation.
Okay. Literally, it's saying that one of the dlls associated with Cryptographic Services on the PC (cryptdlg.dll) is acting up in some way. And if some of those dlls are misregistered, damaged or missing, then you can get an error-message-free iTunes launch failure (even though the iTunes.exe process appears in your Task Manager).
So, first I think we should try checking to see if it's a registration problem with the dlls. With that in mind, try running through *Method 4* from the following Microsoft document:
(MS) You cannot install some updates or programs
*If any of the dlls fail to deregister or reregister,* let us know which ones they are, and what any error messages say when the deregistration or reregistration fails.
*If all the dlls deregister and reregister,* try restarting the PC and launching iTunes again. Does it launch this time?

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