Windows Defender scan hangs at registry key hklm\software\classes\pcast

I am having trouble with a persistent problem that is causing scanners to fail on my system, a Dell Dimension 2300 (P4 1.8Gz) running Windows xp Home Edition.
The symptoms are that the scanner stops at a particular registry entry and, while it appears to keep scanning, (i.e. lights move), seems to get stuck in some kind of loop and can't move on. I can't access task manager from there, and when I move the mouse or attempt to escape my system freezes and I have to force a manual shutdown and reboot.
Windows Live OneCare and Windows Defender both stop at the same location in the scan: hklm\software\classes\pcast. I looked into this and determined that this is an apple entry.
When I navigate to the hklm\software\classes\pcast key there are 2 folders:
DefaultIcon & Shell.
DefaultIcon:
Name: (ab)Default Type: Reg_SZ Data: C:\ProgramFiles\iTunes\ITunes.exe
Shell: (ab)Default Type: Reg_SZ
Open: (ab)Default Reg_SZ
Command: (ab)Default Reg_SZ
C:\ProgramFiles\iTunes\iTunes.exe/url"%1"
If anyone can tell me whether this is causing the Defender scan to loop & then seize in some way or what I need to do to get the scanner to complete a scan, or even if this looks like there's something wrong, I'd greatly appreciate the input.
I've tried excluding itunes from the scan but this doesn't work. I want my ipod to continue to work on this computer so don't want to disable a registry entry without knowing it won't cripple my itunes.
Thanks in advance for any ideas that will help here.
Dell Dimension 2300   Windows XP  
Dell Dimension 2300   Windows XP  

Is your User account on Vista also an Administrator account? Do you have User Access Control enabled? Certain registry & file access tasks which could be achieved by installers in earlier versions of Windows may now a different level of privilege or the use of different calls to the operating system. If you log into your computer as an Administrator, disable User Access Control, grant yourself & the SYSTEM account full access to HKLM in the registry and also to your Music folder then you should be able to complete the install.
tt2

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