OUT OF MEMORY PLS HELP

Engine error - Out of memory at the end of map surface tension at entrance in lambda core.
I read about it, ppl said that at this map a lot of resources… i think simply lacks my 4gb memory, right?
what can i do?

PC:
nvidia geforce 9600gt
amd athlon 2.9 ghz
4gb ram
win7 ultimate x86

I was going to make a comment that 4gb should be plenty but then I looked at the store page and saw this under the recommended specs, Memory: 6 GB RAM

Restart and check your system after it has reached steady state (bootup is finished and everything has loaded, but before Windows/defrag/av scan maintenance tasks start), assuming 5 minutes. Open task manager and see how much memory your using, I would hope it is less than 1.7gb. If not you might need to disable some items that you don’t need starting up or do a clean boot and check to see if Black Mesa continues to have a memory issue. https://support.microsoft.com/en-us/kb/929135

hmm thanks for answer
but all my services is off + operating system turned on performance (0 effects)
i’ll try defragmentation
can i change the game(config) file with resources to set lower amount of details or its impossible?

RedEye
i found solution, simply run away from mass fight, waited few mins, then i went, thats was very hard i had about 20fps… now im in lambda… jeez
anyway thx for answer me today. like

Awesome, Glad you got it going!!!

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.