Installation problems X5

I've used CorelDraw since version 1.0 and now I'm using X3. Finally I got X5, but at my disappointment I get problems with the installation. I've now tried many times in many ways, but the installation stop asking for a SETUP.MSI.... The only relevant SETUP.MSI I can find, is the .MSI-file on the installation CD, but when I'm telling the installation procedure to use that file, it really don't work.

And yes, I've turned off my antivirus and went into ADMIN mode in Wode in Windows, but I get the same result. I've also downloaded a trial version and tried to install CorelDraw that way. Then I get an error message about that there is an earlier version on the computer.

I've wasted many hours, and I'm still trying hard. But I hope someone here can help.

I'm using Windows XP Pro SP 3.