Make absolutely sure that your machine has no software, programs, etc. installed that can be broken by updating past IE6
IE 7 is the browser shipped with Vista
IE 6 is the browser shipped with XP
IE 5 is the browser shipped with Win2k
etc.
updating to IE 6 on win2k is not near as drastic as updating to IE 7 & 8 on XP
for instance if you update to IE 7 on a system that has Nero Express 6 installed, Nero Express will not function ever again on that system, when attempting to run it on the same XP Machine it was already installed and functioning on, it pops up the window:
"This Version of Nero is Not Compatiple with this version of Windows, contact your vendor for an updated version of Nero"
Strange dialog since the windows version wasn't changed only IE
for some strange reason it will work the other way around though:
a Fresh XP install with all the updates applied first including IE and install Nero Express 6 after, then it works
but the program is permanently broken if it's already installed and then the system is updated to IE 7 & up
I always recommend using IE only for sites that need it, such as winupdate, etc.
and for those routers that can't be configured with any other browser, such as certain D-Link routers.