Split the posts from the thread "Node graph out of date - rebuilding" to the Custom Mapping forums.
As you didn't mention any problems with Half-Life 2 single player, I'd assume it's an issue with your map.
Merged the quadruple posts and moved the thread to the Garry's Mod forums, I'll let you have another chance to post the pictures as the forums seem to be fully functioning again.
It seems as if there's a solution to this:
Open the run dialog (Start menu -> Run), type msconfig and press enter.
Select the BOOT.ini tab and click the "Advanced Options" button.
Check the box saying "/MAXMEM=" and set it to the amount of ram you have or something below it.
After that's done...
http://www.fraps.com/
The trial version is free, but has a few limitations (your recorded videos can only go up to a certain size, limited recording-time, your video will be watermarked, and probably a couple of other limitations).