UR doesn't require admin (or power user) privileges for installation, and it can also run from a USB stick without installation.
http://www.kinook.com/UltraRecall/download.html
http://www.kinook.com/UR/Manual/installation.htm
There's also a free UR viewer which can be used to view .urd files for users that don't have UR (which also doesn't require admin privileges to install and can run without installation).
http://www.kinook.com/UltraRecall/viewer.html