"This page cannot be displayed" problem!

Anyone...........
Weird problem on my Windows ME system: I lose Internet connectivity
approximately 15 minutes after bootup. Until then all works very well. But
when it dies, IE has the subject-line error message (whether using my dialup
OR high speed). If I reboot, all works well again for about 15 minutes,
then no more Internet again. Also, my other Internet applications don't
work -- anti-virus updates, Instant Messaging, nothing else! HOWEVER, I can
ping and tracert all over the world!!!!!!!!!!! Everything else on the
computer works great, and no viruses caught by AVG.

This is too crazy. Any help would be appreciated.

EW