Would you like to get Vegas to work or are you ready to try something else? If you would like to get it to work more specific information the error message is needed. If not, I would suggest to try the free version of Lightworks. The Pro version is $60 per year (which is not bad). Here's a link to a comparison between the free and pro versions - http://www.lwks.com/index.php?option=com_content&view=article&id=45&Itemid=184
Adobe Creative Cloud is $49.00 per month with access to all products and or $19.99 a month for selected products (which includes Adobe Premiere Pro). If you go that route you will never "own" the software and if you cancel the subscription you lose the software.