Can't open itunes or quicktime

Question

About a month ago I tried to copy a dvd on my computer, turned out the dvd was in very bad shape and I couldn't do it. A few days later, I tried to open my iTunes and I got the message, "iTunes has encountered a problem and needs to close." I can't remember how I discovered that my Quicktime was having problems, but when I tried to open Quicktime to see what was going on, it absolutely would not open. I've tried re-installing both. I've tried deleating both and re-installing, nothing works. I've actually only been able to delete Quicktime once. I keep getting an error message when I try to delete Quicktime. I'm not sure why I was able to once. I'm very frusterated and can't find my issue anywhere on the support site. Can some one help? I can't even find a phone number to call for help. Please help.
Dell   Windows XP  
Dell   Windows XP  
Dell   Windows XP  
Dell   Windows XP  
Dell   Windows XP  

Answer 1

RUNDLL
An exception occurred while trying to run
"C:\WINDOWS\system32\shell32.dll,Control_RunDLL"C:\Pro
gramFiles\QuickTime\QTSystem\QuickTime.cp\",QuickTime"
OK
It's looking for the QuickTime.cpl in the right
place, so that rules out certain complications
involved with installing a Codec Pack or another
program containing non-standard "QuickTime"
componentry.
So let's try swapping out your QuickTime.
Download and install the Windows Installer CleanUp
utility. then use it to clear any existing
QuickTime installation configuration
information from your PC (Launch CleanUp, find the
QuickTime entry in the list of programs shown in
CleanUp, select the QuickTime entry and click
remove):
Descrip
tion 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?
I tried your suggestion. I'm not very computer knowledgable, but I tried my best. I was able to install the Installer CleanUp Utility, which is where I thought I would have problems. So, I accomplished all that, I was able to make it all the way through deleting the QuickTime folder. When it came to navigating to the C:\Windows\system321. and remove the QuickTime.qts and QuickTimeVR.qtx. I had problems. I don't know if I was in the right area, but I went to the Local Disc and opened it, then opened the Windows folder, clicked on System32 and deleted anything pretaining to QuickTime. I re-started the computer, repaired the itunes file, with my antivirus off and re-started my computer again, but I still can't open itunes, I get the same message. I forgot to mention on my post that I don't know that much about computers, I just know the basics. But I do try to figure things out.
Dell   Windows XP   60GB iPod video