I suspect this may be an OS X issue but every time I start Windows through Parallels, I am prompted to enter my system password. Is there some way to turn this off?
I'm going to venture a guess that you've set up your machine with an admin account and a user account and are launching parallels from a user account. This is my config and I have the same issue. I've noticed that Parallels unmounts the drive that Windows is installed on and if you're using it from a regular user account and not the admin account that it was installed from this would account for one of the password requests (I get two). It is a bit annoying. Not sure of the solution.
It is normal - because unmount operations can perform only root or user in sudoers group.
Even if you have administration right , for every sensitive operation Mac asks password
I've done a bit of sleuthing and am curious whether or not removing the comment from the %wheel line in /private/etc/sudoers would allow me to start a Parallels-7 virtual machine with Windows XP and not require entering a password?
# Same thing without a password
# %wheel ALL=(ALL) NOPASSWD: ALL