Quicktime/Itunes wont start

Hi,
I have a problem with Itunes and Quicktime:
It says on startup of either of them "Quicktime Player/itunes has encountered a problem and needs to close. We are sorry for any inconvenience.
I have the error signatures for both of them below:
Quicktime Player Error Signature: EventType : BEX P1 : QuickTimePlayer.exe P2 : 7.67.75.0
P3 : 4c613a4a P4 : QuickTimePlayer.dll P5 : 7.67.75.0 P6 : 4c613a40
P7 : 00005b6d P8 : c0000409 P9 : 00000000
Itunes Error Signature: AppName: itunes.exe AppVer: 10.0.0.68 ModName: unknown
ModVer: 0.0.0.0 Offset: c4980000
This happens as soon as I try to open Itunes or Quicktime.
I am new to itunes and just got an ipod touch wanted to install itunes and quicktime and it had a problem with windows installer so i reinstalled windows xp and then tried again to install itunes, this time it installed BUT it wouldn't open same with quicktime.
one other thing: I wanted to play an old game on compatiblity mode, so I installed it and it needed an older Quicktime player and the installer came with it so i installed it and when i finished with the game uninstalled it and the old quicktime i attempted to reinstall the new quicktime but the installer woundnt work so i fixed that but now i think it would have something to do with it not working.
I also searched quicktime while it wasn't installed and it came up with all these random files and folders in random places i didn't delete them as i was scared to stuff something up i wanna know if its safe to delete them.
Thanks to any1 who helps

Excellent detailed information. Many thanks.
It'll almost certainly be older QuickTime componentry lurking in unorthodox places on the PC that'll be causing the trouble. First we'll try to track down misplaced stuff in the most common location for it to be causing issues on XP.
You'll need to make sure you are set up to view hidden files and folders in XP.
1. Open My Computer from the desktop or Start menu.
2. In the Tools menu, click Folder Options.
3. Click the View tab.
4. In the "Advanced settings" pane under "Hidden files and folders" make sure that the "Show hidden files and folders" option is selected, and the "Hide extensions for known file types" option is unchecked.
5. Click OK.
Now in My Computer, open your C drive.
Open the "Windows" folder.
Open the "system32" folder.
What files and/or folders can you see in there with QuickTime in the file/folder name? (In a standard installation of QuickTime, you should see precisely two files ... QuickTime.qts and QuickTimeVR.qtx ... and no QuickTime folders whatsoever.

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but when it comes to install/uninstall an error comes out : An error ocured while installation
Let's try getting the program uninstalled by other means then.
Download and install the Windows Installer CleanUp utility:
Description of the Windows Installer CleanUp Utility
Now run the utility (“Start > All Programs > Windows Install Clean Up”), select any QuickTime entries in the list of programs that appears in CleanUp, and then click “Remove”.
Next, we’ll manually remove leftover program files and folders.
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2. In My Computer, open Local Disk.
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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”.)
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