zuluclayman

Re Vegas - as Koala (and you) have suggested I would guess at it being a system problem with heat the most likely suspect rather than a Vegas issue - rendering video is very resource intensive and will most likely see your CPU usage up close to its max leading to high temps if used over a sustained period of time which will shut you down - I used to get this on my old system until I re-pasted the CPU and cleaned up the heatsink, case fans and inlet meshes (which were clogged with grime)

to get your case sides off - there should be some screws at the rear of your case - unscrew them then slide the side either backwards or upwards to release the locating lugs.