The PC runs Internet Explorer 5. The Windows 2000 operating system would have updated the browser to version 6 (last supported version on that OS) through the Windows Update function.
When Lerner sees the PC with Windows 2000 Professional as its operating system, she is complaining "How did this thing survive Y2K" (referring to the Y2K bug). This makes no sense because the problems with Y2K were fixed beforehand and so there were no widespread issues.