Try to open it in WinXP compatibility mode.
That should work.
Right-Click onto the Program icon, choose "properties" (or similar; the last item in the context menu), goto flag "Compatibility", mark the checkbox "open program in compatibility mode for...." - and choose one of ehe offered Windows versions.
On the other hand - I had no difficulties with the installation under Win7/64 - maybe you d/l-ed the 32bit-version (honestly, I don't remember whether there was a 64bit-version).
Michael.