Running 2008 SWExplorer with SW 2007 Problems

I had problems upgrading SWExplorer2007 service packs so Idecided to uninstall it and install SWExplorer2008 (2007 is notavailable for download any more). So when I try to run it fromTools, SolidWorks Explorer in SW2007, I get -

Unable to launch SolidWorks Explorer. Please make sure SolidWorksExplorer 2007 is installed. Is there a way to fix this?

I can open it from the desktop but it's just annoying.SolidworksSolidworks Explorer