I, like some others was having some trouble with my version of Sony Vegas. I use the Movie Studio 10 version and was having a terrible time editing larger projects. It would freeze and crash after working in the program for around 5 minutes and rendering was impossible. While looking for a fix, I came across Large Address Aware. Simply, it tells older versions of Vegas (or any program) to use more RAM. Works like a charm now!

http://www.techpowerup.com/forums/threa … re.112556/

It could be helpful!