Airshou is the best screen recorder for iOS devices. This one is available for Android devices as well. You can get this screen recorder without jailbreaking

I have a free download that requires no administrator rights, and, no trial, it's forever. Here is the link:www.hyperionics.com/hc/downloads.asp CTRL+C(While highlighting link) then CTRL+V(When in URL address entry bar)
To use this software
Step 1: Download 32 bit from server 1 if you have a 32 bit cpu. Download 64 bit HyperCam 2 if you have a 64 bit cpu. If you dont know which one you have, look up how to find out. By the way I am explaining with a compatibility of Windows 7, Windows 8, Windows 8.1 Preview.
Step 2: Open .zip folder and extract it.
Step 3: find a file called Screen Recorder(Or HyperCam2) in the .zip and open that.
Step 4: There is your screen recorder, no lag!
Information provided by: COD_KILLER33
Subscribe to me please!

This is the only one I can think of, and it doesn't require admin. :)
http://www.screencast-o-matic.com/

HAVE FUN!

Try this:www.microsoft.com/en-us/download/details.aspx?id=24601

the tutorial:www.youtube.com/watch?v=gYhSo7U_CCg&feature=related made by Husker Mania

ezvid is free and has no 30 day trial. ezvid[dot]com