ITunes 7.7 - Can't open! Error message - PLEASE HELP!

Question

Hi, I've recently updated to iTunes 7.7 and now I can't open iTunes. I've tried reinstalling itunes, quicktime and even did a system restore, but still couldn't get iTunes to work. Btw, I'm running XP pro w/ SP3. The error message I get is this:
And when I click the "Click Here" link, i get this:
Please help!!

Answer 1

when I tried to open quick time i got a rundll error - an exception occurred while trying to run
In that case the QuickTime problem is likely causing the iTune problem. So we'd better try swapping out your existing QuickTime.
Head into your Add/Remove programs. uninstall QuickTime.
Next, we’ll manually remove any leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx. (If “Hide filename extensions for known file types” is enabled on the PC, then those two files will appear as “QuickTime” and QuickTimeVR”.)
7. Restart your computer.
Now download and save a copy of the latest standalone QuickTime installer to your hard drive. (We'll run the install from there rather than online.)
Latest Quicktime Installers … get the one that doesn’t mention iTunes
Switch off antivirus and antispyware applications prior to the install. Start the install by doubleclicking the QuickTimeInstaller.exe.
If that install goes through okay, restart the PC and try launching iTunes again. Does your iTunes launch properly now?
(If you get an error message on the QuickTime uninstall or standalone reinstall, let us know what it says. Include error message numbers if you're getting any.)