SLOOOOW to connect to Internet Explorer

We have a Win2000 PC that recently started to take forever to load Internet Explorer. It is Internet Explorer 6.0 SP1. The hard drive has plenty of defragged free space, there is nothing else currently running (the Task Manager processes shows only the System Idle Process and IE active). The PC has 256MB ram. Another PC on the same LAN loads IE in 4 seconds. Once IE is loaded, she seems to have no problem browsing. Other applications load in a normal amount of time. Why does it take so long for IE to load?