Latest iTunes and QT install properly, will not run. Help?

Fujitsu laptop 2.8Ghz, 512MB memory, XP SP2, iTunes 6.0.2.23, QT 7.04. Hardwired to router/cable Internet connection.
I am a dedicated Mac user, and friend has the above equipment. He had a previous point level version of iTunes that stopped working about the time he started using his new Nano. He removed iTunes and downloaded latest (above). Installation runs and finishes normally without any informational or error messages. Attempts to run iTunes from the desktop, or directly from the iTunes application fail (w/o any messages). Like a cat, it just ignores you.
I personally used the control panel to remove iTunes, and then delete iTunes folder corpse in program files. Rebooted the computer, downloaded (above) iTunes/QT package. It installs normally, yet any attempts to launch iTunes recreates the no activity situation. Both network installs and local installs produce same result.
He is going to use his vendor supplied backup disks to reinstall the computer. Then perform O/S updates, and then try to reinstall iTunes/QT again.
Is there any malware in the wild right now that may be contributing to this issue on Windows platforms? I will also be recommending that he turn off his Symantec A/V software for the next install, though it wasn't off during the initial successful installation and use of iTunes.
Any constructive ideas to get back out of the ditch? Yeah, I tried for months to get him over to the Apple side without success.
Thx,
Chuck
iMac DV SE, 400Mhz, 1GB Ram, 120GB Seagate   Mac OS X (10.4.4)   Macally PHR-100AF Firewire Enclosure

Ok it is solved.
Reinstalled iTunes 6.03/QT 7.04 bundle with Norton Internet Security turned OFF.
With NIS still off, launched NIS panel and selected programs tab. Went to configure button, and then added each iTunes and QuickTime executable to NIS with "Permit" authorization.
Turned NIS back on and rebooted. Upon restart, clicking on iTunes desktop icon launched and played iTunes normally. Visited Apple music store, and also launched QT movie trailers without issue.
Again, friend's Fujitsu laptop running XP is now working fine after a hard lesson with Norton Internet Security application.
Thankyou,
/ckh

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