The install size of Opera 11 is only 6MB and it install very fast.
If I was going to install a new browser it would be Google Chrome:
http://www.lucidchart.com/blog/2010/09/16/ie9-ff4-beta-in-real-world-benchmark
Platform Preview 7
Released November 17th 2010
http://ie.microsoft.com/testdrive/info/downloads/Default.html
When i installed the installer of IE9 i clicked save and than i saved it to the desktop. Than i Right Clicked it and click on Properties Than clicked unblock program. Than i of course installed it. than i tried the windows start menu search which didn’t work… Microsoft people should make it a optional update with windows update for us windows 7 users.
I did a system check on my computer and for some reason i can’t install a beta version of ie with out a program or a windows feature messing up on me… I guess i will have to wait for the full more stable version of internet explorer 9… I am getting my computer re formated Monday. and it will come pre loaded with McAfee Internet Security again… 
but my computer will be a lot less glitchy.
This will fix your McAfee problem http://uninstallers.blogspot.com/
I know that link i ran the uninstaller from that site a few months ago. but before i ran it mcafee did a update which crashed my computer 10 times in a row. But my computer is running good now.