Beside me this works and in 'XP!
Attention -
if beside you several programs with similar protection ('sase.ocx'), that this will bring about conflict!
Beside me this - 'ICC AVR' - 'ICC TINY' - 'CodeVision AVR'.
IF 'ICC AVR' -> UnREG 'ICC TINY'
IF 'ICC TINY' -> UnREG 'ICC AVR'
IF 'CodeVision AVR' -> UnREG 'ICC AVR' & 'ICC TINY'
Beside me so works!