does a computer virus affect all accounts on the computer?

Question

I am trying to test a game exploit software but are unsure if it has a virus,I want to try it on a seperate user account on my computer but I am unware if it will spread to other user accounts.

Answer 1

A virus does whatever it was designed to do.

If you run it with administrative privileges (you get the security prompt when launching it), then it can theoretically do everything it wishes with the PC.

Otherwise it's limited to what you (your user account) can do. (including exploitation and privilege escalation - see Kamil's comment below)

The golden rule is: Don't run anything you don't trust, ever.

See also: How can I remove malicious spyware, malware, adware, viruses, trojans or rootkits from my PC? (read this before attempting anything).