Full HD with video from Camtasia Studio put into Vegas


I Love YTtalk
Does anyone here know how I can get full 1080p videos from a 1080p Camtasia WMV render which is then added in Vegas and edited and then produced? I have tried using full HD wmv settings in Vegas afterwards and for some odd reason it is ending up poorer quality than the source and what Camtasia produces. It doesn't seem to be be any Vegas setting issues as far as I can see. Any help would be appreciated :)

Thank you.