'Error: Could not fork child process' while opening Sage

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Thank you. However, this only worked together with the following (for those in the same boat):

1. On Windows 10. Go to Windows Security/defender settings
2. Go to Apps and Browser control
3. Go to Exploit protection settings
4. Switch OFF Force randomization for Images (mandatory ASLR)
5. Switch OFF Randomize memory allocations (bottom-up ASLR)

After Restart Sage works like a charm.

Another possibility, which I've seen many times, is some virus scanners will attack and/or interfere with Sage ("bash.exe? That's a hacker tool! There's no reason that should be on Windows!), so it's best to add an exclusion in your virus scanner, if you have one, for Sage's install directory.