Itunes program not responding and wants me to send error report

I have read many posts and answers to this problem and have tried about everything that I have read. When I try to open the itunes 7 program on my desktop, it says the program cannot respond and must shut down. It also asks if I wish to send an error report. I have installed and uninstalled the itunes 7 program several times. I have disabled my spyware applications and my norton antivirus programs and then tried to re-install and I get the same thing. I have also tried to install Quicktime 7 stand alone program and when I try to install and run this program another message comes up that states that it cannot install this Quicktime program because another more recent QT program is already installed on my computer. I am really starting to go crazy here. Can anyone help?

replying to slubadubseano
When I try to open the itunes 7 program on my
desktop, it says the program cannot respond and must
shut down. It also asks if I wish to send an error
report. I have installed and uninstalled the itunes 7
program several times. I have disabled my spyware
applications and my norton antivirus programs and
then tried to re-install and I get the same thing. I
have also tried to install Quicktime 7 stand alone
program and when I try to install and run this
program another message comes up that states that it
cannot install this Quicktime program because another
more recent QT program is already installed on my
computer.
okay, let's try this first.
head into your Add/Remove programs. uninstall
QuickTime.
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 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?
i tried all above as i am having the same problem, but i still get the message "itunes has encountered a problem and must close" and quicktime still does nothing when i try to open it...

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