Idle Time Out (216.55.181.75)

I have a Wired Base Station MN-100 and I can login my
Base Station and it shows all connection time, IP
address, and everything.

Hey this is my problem for the last two week everytimeI
leave my pc idle or a web page for about 3 to 4 hours,
when I try to surf or open IE it always come to thus page
http://www.dnscaching.net/dnserror/?
url=http://www.yahoo.com/. Even when I check my e-mail
with Outlook Express it times out. I went to that web
address(216.55.181.75) it comes to a login screen.

I ran Spybot 1.3, Spyblaster,and Spysweeper I still get
the same thing. I've updated my McAfee Virus scan and
Security Center and did a system sweep. I rolled my
system back using System Restore on Win XP home. I
updated my firewall(Zone Alarm) and still get the same
thing. Uninstall TCP/IP,checked my network connection,and
relesed and renewed the IP address. I checked all my IE
settings: deleted files,cookies,cleared history,set to
never dial a connectin etc...I every switched the ports
on my router.
But, here is the funny part during the same time I can
still connect to IMesh, update my antivirus, and still
pull a valid IP address. I can drop my router and surf
and get my email using my DSL PPPOE connection. If I
rebbot my computer I can surf with no problems. I can
using my dial-up modem then drop the connetion and boom
I'm surfing.
The only thing I've done to my network is updated my
router firmware MSBNDownload.exe (13MB). My Win 98SE PC
connects all the time.Do I a router issue, OS, or trojan
on my PC? Can some please help me or set me in the right
direction?

howard a.k.a Superman