I have been having this problem for about a year now and I don't know what else I can do, so I am hoping someone can help me. 

I have an Inspiron 7000 notebook running Win2K connected to a Linksys cable router via a wireless card.  The connection itself is fine -- I get an IP, no dropping, good signal, etc.  What happens is that periodically anything internet related (I use mostly IE & Trillian) starts blanking out on parts of its content.  For example, in IE, a web page will load about half of its content, but will indicate that it's done.  Or Trillian will pop up a message window, but the text will be blank.  Again, the connection itself does not drop nor do I get any sort or error messages. 

Sometime this problem happens after a few hours of the laptop being on, sometimes after a few minutes, sometimes not at all.  A reboot usually fixes the issue temporarily.  I know it's particular to this machine, because I have a Latitude with the same OS and I've never had it happen on that one.  I have tried switching cards, I have updated the router's firmware several times, and I have upgraded both IE and Trillian.  I have done umpteen virus scans.  Nothing I do seems to make this totally go away.

Any ideas would be most appreciated!