Error message

  My Grandsons computer Dell2350 cpu 2.2 512 memory has a problem ,on boot up, we get an error message rundll error loading doceoc16b1 the specified module cannot be found,and then another message comes up and says the same thing about this (gktryme.exe). After boot up every thing seems normal except when he goes on the internet He can't go to any url  just the home page..You can type in the url but that familar message comes up about not being able to locate the url. He has the reinstalling dell tools system software disk , would that be of any help , or does it look like the computer needs to be reformated, We hate to do that because of so many school projects he has on the computer. He has Norton anti virus also norton's ghost I was thinking of getting rid of both of them. Any one have any ideas as to what is the problem ?. Thanking you in advance for all your help.                                     Bob Moyer