Error opening iTunes, says I don't have quicktime

Question

I installed the itunes update yesterday, and when I tried to open it, it said I didn't have the right quick time update. I then separately installed the new quicktime update, and it still said it wasn't right. Today I deleted all my itunes files and folders and re installed it. And still it is coming up with an error message, any help?
Also, my roomate downloaded the new itunes, and her computer won't even boot up anymore.

Answer 1

when I go to add/remove programs, quicktime isn't there, where can I find it, other than there?
let's try this.
Download and install the Windows Installer CleanUp utility. then use it to clear any existing QuickTime installation configuration information from your PC:
Description of the Windows Installer CleanUp Utility
Next, we’ll manually remove 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.
7. Restart your computer.
next, we'll get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the reinstall.
go into Add/Remove and select itunes. click "Change" and then click "Repair".
if the repair install goes through okay, restart the PC and try launching itunes again. does it launch properly now?
(re your roommate's booting issue. does she have a Windows 2000 PC? if so, does she have one of the early Adaptec versions of Easy CD Creator 4 installed on it?)