I have tried to install the 3CX VOIP Client but get the following error. ‘Setup has detected that #CX IP PBX System is installed on this computer. Please de-install 3CX IP PBX System before proceeding with the 3CX VOIP Client installation.’ (see attached). I have downloaded the 3CX VOIP Client last version 727 numerous times but get the same error. I use 3CX Phone system ver. 6.0.806.0 with MS Vista SP1. Any suggestion please? Thank you.