Itunes no longer even loads

Question

I wanted to update the OS on my Ipad (1), but in order to do so I had to update my itunes. NOW i cant even load itunes at all let alone update my ipad.
Ive tried everything I read on the support pages here - uninstalling apple programs, trying to re-add the missing dll files, running the installer as admin so on and so on and so on. Uninstal, re-intall, uninstall, re-install - only so many times i can do that.
The awesome apple idea of unistalling apple programs is whats causing my current frustrations (bonjour, apple application support, ect).
and what heck is this error:
Im getting a little tired of all the hoop jumping i have to do just to a simple thing as trying to update apple software.
ANyway, now on this computer, itunes is fubar. Cant run itunes, cant update the ipad, cant do anything.
Thanks apple. so far only 4 hours wasted.

Answer 1

These ones are tricky. But the following instructions are worth a try.
First do a complete uninstall of iTunes and related components (but don't reinstall just yet), as per the following document:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
a. Launch regedit (Start >> Search Programs and Files >> type Regedit and open the regedit that comes up.)
b. Access the following Location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData \S-1-5-18\Components
c. Perform the following actions
i. Right Click on Components Folder
ii. Select Permissions
iii. Select Full Control and Read Permissions options
iv. Select Advanced Button
v. Select Owner Tab
vi. Select to Change Owner to the Administrators
vii. Check the option “Replace owner on subcontainers and objects”
viii. Select OK when prompted that it may not change all.
ix. Select Apply
x. Select Apply again
xi. Exit the Registry Editor
Now try reinstalling iTunes again. Does it go in properly this time? If so, does it launch properly now?