V8i SS4 wont start!!

I have downloaded and installed SS4, which has un-installed SS3 as prt of this but SS4 wont start. I have clicked the icon a number of times but nothing starts. Th wheel spins fro a biit but then stops. NOTHING HAPPENS!!

What am I supposed to do now as I have drawings to get out. Have to say that this is very frustrating and most disappointing!!