Hi,
This is one of the most common questions/frustrations about Windows Vista. Even if you log on as an administrator, you don't really have administrative rights, thanks to UAC (User Account Control). UAC runs almost everything using non-administrator rights to help protect you from bad software that would abuse those administrator rights to change your settings or install viruses.
When you run a setup program, UAC should automatically prompt you to run it as an administrator using the UAC prompt (which Microsoft calls the "consent" prompt). If you don't see this, right-click the program, and then click Run As Administrator. Then, it will really run as an administrator. It should have prompted you, but for some reason, Vista didn't realize it needed Administrator rights. It wouldn't hurt to check the software developer's website for a version of the program made for Vista; that would also fix the problem.
If you really get sick of this, you can try disabling UAC-you'll be giving up a lot of Vista's security benefits, though, so I don't recommend it.
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