You may need to increase your Page Filing?
To do this:
1) Control Panel/Systems/tab Advanced click button Settings
2) In the Performance Options window click tab Advanced/Frame Virtual Memory/Button Change
3) You can increase Paging File up to leave 500 MB free space unused needed for operating Systems Files.
When working with large files it is best to close all programs you are not using, this help take the strain off your CPU and releases more RAM.