What version of SolidWorks are you installing?
Year and Service Pack:
Is it a stand alone license or Network license?
Are you trying to load from CD or Download or Image?
I NEVER install from CD (they are usually SP0 and often have bugs.
Best is to Download the newest version and SP. you can use (have license for), Have the entire download on your computer (not network) and then load from that file.
From what I remember, might be caused by wrong version and/or Service Pack. Are you sure you are entitled to that version you are trying to install with that exact Key? Might be a mismatch of those.
I'll look it up in the Knowledge Base anyways and post you an update.