Shut off UAC.
It does absolutely nothing but ask you if you want to do what you just did.
UAC is a Microsoft legal dodge to put the onus on the user, rather than
Microsoft, if you accidentally install malware that the OS is subject to
because of poor design and incapable of warning you for real if you are
about to do something bad.
I like Win7 but it is as fundamentally flawed in design as XP and Vista: it
still uses a corruptible registry, allows scatter shot installation of dlls,
active x and all the other ills that plague Windows users.