cannot log into some sites

I have just got a replacement notebook computer loaded with XP Media
Edition. I still have my previous notebook, and it is loaded with XP
home. The old computer works fine thru my Wiflyer wireless network and
accesses any site I go to. The new computer, however, does not. I can
go to Ebay, but not MyEbay. I cannot search Ebay. I cannot get the
Windows update to run. I have enabled all cookies, checked override
automatic cookie handling, turned off all antivirus software and
removed all firewalls. I have no problems loggin into my secure bank
account information. I have looked thru every security setting I can
think of and cannot find the solution. I thought at first it was a
security issue, and it must be on this machine as the other one works
fine. One way I CAN get it to work is to go delete the cookies, every
time. I can go to Ebay, then click MyEbay, and it will not go. I delete
cookies, and click it, and it goes immediately. Then, I try to look at
my feedback. It will not go. I delete cookies, and click it and it goes
immediately. Any help would be appreciated. I just cannot figure this
out.

Thanks


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wheeldawg