What are today's choices in circuit simulation software?
Multisim is very good, but expensive, and it won't run unless you either log in as administrator or give all users write access to its directory in Program Files (which it doesn't do for itself when you install it). What's more, it goes into an endless loop if you don't do this; you press "Cancel" and get the same message and the same invitation to cancel, over and over. I've just been trying out their free trial version, which is good for 45 days and appears to be excellent apart from the file-permissions problem.
Is there anything out there that is cheap and useful?