i have the dreaded triangle icon in yellow too. brand new, out of the box toshiba windows 7. i have had many issues, but this one takes the biscuit. so....i connect to many routers in different countries. also i use a Alpha wireless Lan utility with an
external antenna to give increased wifi conectivity. either with or without the external antenna i get this problem, the dreaded yellow icon over the wireless indicator at the taskbar. i have been meaning to post on here for ages but have just got the time
now, hence this post.
so here is my theory. i have no problems with certain routers. i have performed every repair and reconfigeration and uninstall as is humanly possible. one thing that works allbeit temporarily, is uninstalling the driver, but even now i find that this
fix does not work anymore. the router is a NordNet 26CC. it is a tiny thing and if i re set it the problem sort of goes away then returns another time, or when i disconnect re connect the offending laptop. i deduce therefor, that if you have followed instructions
and uninstalled drivers and re set things, and still have the problem, then the problem is with the router. this is annoying, as an xp model and another windows 7 model work perfectly, but this toshiba does not. i still get internet, but that irritating yellow
triangle sits there and reminds me that the ubuntu is beckoning. don't get me wrong, i love microsoft, but for me, with issues like this, and others i fail to mention, it's days are difinitely numbered.