System is Dell Dimension 8300 Win XP Pro with Service Pack 2 and 512 MG RAM
Yesterday all was OK and all sites connected but today certain sites would not connect such as MSN and some banks(I can't log in to check acc'ts) other banks are fine.
No changes were made to the system. I tried turning off ZoneAlarm and did a virus scan with McAfee and Spybot.
Also could not update Spywareblaster as message said could not connect with internet even though I can access most sites.
I cleared
Any thoughts would be appreciated.

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