I'm also having the same problem. Fresh Win7 Pro 32-bit install. :matte-motes-sour:
I work in IT, so it'snot like I don't know what I'm doing. I have all necessary latest Nvidi GeForce drivers + all .NET etc.
(Core2duo 2.4ghz - 3gb mem - win7 pro 32-bit - nvidia geforce 8800 gts)
trying latest downloaded SL : v2.7.5.235722
there's no reason this shouldn't be loading. it crashes as soon as you launch it. wish there was a debugger of some kind so i know what's causing it to crash. i know there's a win_crash_logger.exe in the program dir, which i've opened/submitted, but it doesn't give you the info it collects on startup crash.
EDIT: where can we download older version of the SL viewer?
EDIT2: sorry, i'm an idiot & cannot read others who have asked same thing
http://wiki.secondlife.com/wiki/Old_versions