How to change max number of programs running in the background on Windows 7 or 2012?

I created a server program I want to run in the background, but I found Windows can run only about 256 background processes at the same time by bat file. I can't run new background processes and I start my server program by bat file. The system tells me something is wrong, like this:

Faulting application name: cmd.exe, version: 1.0.0.0, time stamp: 0x545042b1

Faulting module name: KERNELBASE.dll, version: 6.3.9600.18438, time stamp: 0x57ae642e

Exception code: 0xc0000142

Fault offset: 0x00000000000ecdd0

Faulting process id: 0x2d08

Faulting application start time: 0x01d4982a2b4df4a1

Faulting application path: C:\Windows\system32\cmd.exe

Faulting module path: KERNELBASE.dll

Report Id: 6931568f-041d-11e9-80fa-988f90cb5a9d

It's no problem that if I directly run about 300 server processes.

I don't know that Windows have some limit about it?

I want to run about 300 background processes at the same time.