Updating to iTunes 7 - error: files are missing

Question

After downloading an update to iTunes 7: When I click on iTunes, I get an error message which says: "iTunes cannot run because some of its required files are missing. Reinstall iTunes."
If I reinstall from the beginning, will I lose all the hundreds of dollars of music I have bought?!!!!!!!

Answer 1

let's try swapping out your QuickTime one more time. let's try the following procedure:
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 try to 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 repair install.
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?