Web Pages

Problem,web page loads but various buttons and pics remain in standard form (white box with X).Only occurring on sites using GIF,& on secure sites I rec page not found during some executions(eg:banking).Tried reinst ie5.5sp1 didn’t help,now using ie5.5sp2 still didn’t help.Reset all internet options back to default no go.Sometimes moving mouse over button causes display feature to form,refresh works pt of the time.Is it caused by these sites using web bugs???,if so whats the fix.System WinME,installed zone alarm pro,adsubtract pro,norton sys works 2001.