OK, found how to change virtual memorie.
Changes settings to 3500 and 5000.
That sound OK? Acceptable?

Guess not, Vegas crashed!

When prerending short clips, 14 and 16 secs, renders hang at 35% and 50% respectively.
These are MXF files, 720p 60
After trying a 1:35 clip render hung at 3%.
Message says VIRTUAL memory is low.
How do I rectify this?
Is it simply my having more RAM installed?