My clock on my computer is now set to military time after an antivirusxp intrusion. I think I got it removed by using Malewarebytes but I cannot reset it to regular time. Is there a way to do this?

So what's wrong with the twenty hour clock (military time). Just start counting on your fingers. Do you not have other clocks ?

System restore is working? Try that out.
Control panel+ Date and time or,
Control panel+display

Note: antivirusxp is the most annoying malware I have seen.