I have a couple Dell Optiplex Computers running Windows XP SP3. These two computers have the odd problem of freezing intermittently when the user is accessing web pages via Internet Explorer (IE8) or Mozilla Firefox.
I installed the latest Dell NIC drivers and system firmware; no change in the problem.
I replaced the old office router with a new one; no change in the problem.
I installed the latest Symantec Endpoint Protection; no change in the problem.
Short of completing a complete system reload of the OS and all software, what else can I do to search for the root cause?