Thanks, cotton!
Okay, we'll try swapping out your existing QuickTime one more time, taking a few extra explicit precautions along the way.
First, download and save a fresh copy of the QuickTimeInstaller.exe to your hard drive. (Don't run the install on line and don't run the install just yet.) Get the installer that
doesn't mention iTunes:
http://www.apple.com/quicktime/download/
Now head into your "Uninstall a Program" control panel and uninstall QuickTime.
Next we'll remove any leftover QuickTime program files and folders.
Restart the PC.
Open Local Disk C: or whichever drive your *program files* are installed on.
Open the "Program Files" folder.
Right-click the "QuickTime" folder (if it still exists) and select Delete.
Go back into Local Disk C: or whichever drive your *Operating System files* are installed on.
Open the "Windows" folder.
Open the "system32" folder.
Right-click on the
QuickTime file (if it still exists) and select "Delete".
Right-click on the
QuickTimeVR file (if it still exists) and select "Delete".
Empty your Recycle Bin and restart the PC again.
After the PC restarts, *do not open any applications.* Disconnect from your network and/or the internet. Now disable
all your security software (firewall, antivirus, antispyware).
Now start the QuickTime install by doubleclicking on the QuickTimeInstaller.exe file you downloaded earlier.
Reenable all security software prior to reconnecting to the internet and/or your network.
Did that install seem to go through okay? If so, does QuickTime launch normally this time?