Sorry Mate, you were right. I'm updating my reply about "A/V" software....it is anti virus that caused the problem, and I assumed that turning AV off would be sufficient when it's not, because the AV rejection setting is still there after initial detection even with AV turned off. So I went into the AV settings and reversed that setting. Downloaded imgburn (newest version on XP without issue. Thanks!
PS
For your info I use Comodo Internet Security which at times seems pretty severe, but otherwise I like it above the so called conventional AV security.