Hi
I don't know what mmscomposer.msi is. Duplicate Cleaner doesn't use a Microsoft (msi) installer so it shouldn't ask you anything like this. Try downloading the file again - also Duplicate Cleaner 1.4.3 needs Windows 2000 or higher.
Thanks for your answer. I do not understand nor. My system is XP Pro. After installation, when I run DC, MMS Composer is launches for installation, and all is blocked What can I do ?
@Marius: I guess, you installed a MMS composer software either for your mobile phone or your desktop. And I guess, you had trouble with it. Have a look at this MMS software, not at Duplicate Cleaner. I installed Duplicate Cleaner several times and I never had problems.