Problems opening iTunes after installation - "QuickTime was not Found"

I am having trouble opening iTunes. Both iTunes and Quick time will download and install and I can open QuickTime without a problem, but when I open iTunes, I get the following error:
Open iTunes and an error opens:
"QuickTime was not found. QuickTime is required to run iTunse. Please uninstall iTunes and then install iTunes again."
I only have trouble when I am at home and not connected to my work network. I was able to start iTunes yesterday while in the office, but all my music is on my external hard drive at home. Not helpful!
I have tried about everything - uninstalled, reinstalled itunes and quick time, disabled bonjour, disabled the startup files, etc. I am still not having any luck.
Any suggestions?

Both iTunes and Quick time will download and install and I can open QuickTime without a problem, but when I open iTunes, I get the following error:
A bit unusual.
Did you do the QuickTime/iTunes install at work?
Is QuickTime still launching when you get the PC home?
(Wondering if something relating to the network at work have done odd things to QuickTime or iTunes registry entries ... possibly iTunes is looking for QuickTime on the wrong drive when you get the PC home, for example.)

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