ITunes spontaneously closes - no error message

Question

I've just started having recent - but consistent - problems on my WinXP system. iTunes runs, and can see my iPod Touch. I want to add video files to it. So I select File > Add Folder to Library. I navigate to the folder containing my videos. I click OK, and iTunes closes. No error message; it just closes.
I try a similar procedure with File > Add File to Library, and the same thing happens. As soon as I specify the file, iTunes closes, with no error message.
Here's a list of what I've tried so far:
1) Rebooted system
2) Reviewed the Event Manager logs (eventvwr.msc) - no crash was listed
3) Repaired iTunes installation
4) Uninstalled QuickTime and iTunes, reinstalled
5) Deleted:
C:\Documents and Settings\(name)\Application Data\Apple Computer\iTunes
C:\Documents and Settings\(name)\Local Settings\Application Data\Apple Computer\iTunes
C:\Documents and Settings\All Users\Application Data\Apple Computer\iTunes\SC Info
... and ran iTunes.
No luck so far, and as far as I know, there is no other way for me to get files from my computer to my iPod. Can anyone suggest other solutions?
Many, many thanks.

Answer 1

Ok... I called Apple Support. and they were more helpful than I expected. There are several things I don't like about Apple, but let it go on the record that their customer support was excellent.
The gentleman to whom I spoke (Case# 132295246) suggested that I try accessing my OS using an alternate user. My single-user system didn't have any other users, so I quickly created one (Control Panel > User Accounts). Once I was logged in as the new user, not only did the QuickTime player load, but iTunes worked perfectly.
On the tech's suggestion, I agreed to compare the service lists between the two accounts (I didn't make him stay on the phone for this). Unfortunately, they were identical. So I turned my attention to the system tray (in the bottom right-hand corner), and noticed the ATI Tray Tools icon. I exited the app, and suddenly everything worked.
Ok, we have an easy workaround, but we can do better. Any technically-oriented PC user with an ATI card isn't going to want to give up ATI Tray Tools - it's a wonderful piece of software. Fortunately, the program allows one to define exclusions that can be applied to ANY file that conflicts.
So for Apple's benefit, I hope this gets added to the knowledge base:
Problem:
iTunes spontaneously closes during use, no error message.
Diagnosis measure:
The problem is resolved when logging into WinXP as a newly-created user.
The user has an ATI Video Card
The user is running ATI Tray Tools
Resolution 1:
Close the ATI Tray Tools application before running iTunes.
======================
Resolution 2:
Add iTunes to the ATI Tray Tools exclusion list:
1) While ATI Tray Tools is running, right-click the ATI Tray Tools icon in the system tray.
2) Select Hardware
3) Select Auto-Overclocking
4) Click the Exclude tab
5) Add the following programs to the list:
C:\Program Files\iTunes\iTunes.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\QuickTimePlayer.exe
6) Click OK
=====================
Additional note: If you have any other programs that will not run (no error messages), locate the executable, and add it to the exclusion list. I was able to solve my Java problems by adding the necessary executables from the C:\Program Files\Java\jre6\bin folder.