Running itunes problem..

Question

I can't run my itunes, every time I open it stopped working. window support says it's due to data execution prevention. I followed these steps :
http://discussions.apple.com/thread.jspa?messageID=11964647&#11964647
but I'm missing the QuickTime.qtp file. it's not there..
now the itune can be openned but every time it starts a pop up : [This application has failed to start because ASL.dll was not found, Re-instaling the application may fix this problem.] but the itune starts anyway.

Answer 1

Good-o. Let's try moving forwards. Best to print out a copy of these instructions, because at one stage of proceedings you won't be able to use a web browser.
Preliminaries
Download and save a fresh copy of the QuickTimeInstaller.exe file to your hard drive. Don't run the install on line and don't start the install just yet. Get the installer which doesn't mention itunes:
http://www.apple.com/quicktime/download/
If open, close all of iTunes, QuickTime and/or the MobileMe control panel. (Since all use AAS they can all interfere with the QuickTime/AAS uninstalls if open, and QuickTime could interfere with its own uninstall.)
*Uninstall phase*
Head into your Uninstall a program control panel. Uninstall QuickTime. Uninstall Apple Application Support.
(From this point on until we get AAS and QuickTime reinstalled, iTunes won't run (because it uses both other programs) and the MobileMe Control panel won't run (because it uses AAS).)
Next we'll remove any leftover program files and folders.
In Computer, open your C drive or whichever drive your program files are installed on.
Open the "Program Fiiles (x86)" folder.
Right-click on the "QuickTime" folder (if it still exists) and select Delete.
*Staying in "Program files (x86)",* open the Common Files folder.
Open the "Apple" folder.
Right-click on the *Apple Application Support* folder (if it still exists) and select "Delete".
Go back out into Computer.
Open the C drive or whichever drive your operating system is installed on.
Open the "Windows" folder.
Open the "SysWOW64" folder.
Right-click on the QuickTime.qts file and the QuickTimeVR.qtx file (if they still exist) and select "Delete".
Empty your recycle bin.
*Reinstall phase*
Restart the PC. After the PC restarts, you'll get another bunch of error messages from iTuneshelper and other background processes. Click through those. Do not open any applications after the PC starts.
Disconnect from your network and/or the internet. Now switch off all your security software (firewall, antivirus, antispyware).
Now start the QuickTime reinstall by doubleclicking the QuickTimeInstaller.exe you downloaded earlier. (This should reinstall Apple Application Support, too.)
Reenable all security software prior to reconnecting to the internet and/or your network.
Did the install seem to go through okay? If so, restart the PC. Do you still get the error messages on restart? If not, how about when launching iTunes?