True, DMILETTE , it can be other reasons. Verizon's VCAST software also conflicts with itunes, especially with making it hang on the processing file part at the end. Sony Vaio users have problems with some Sony software deleting their library files, etc and so on....
Sony has come out with a patch, I'm not sure about Verizon, and from what I hear the newer versions of Norton/Symantec are not as bad as the older ones. I guess my point is that Apple cannot "fix" another program that directly conflicts with itunes. You're right - some folks will figure out what is conflicting on their systems, others will just buy elsewhere.