MS Office Outlook 2003 TERROR !!!

Recently i set up a MS Office Outlook 2003 mail account for a user on her PC but she has problems receiving mail. First she couldn’t do both send and receive, so i removed Norton Anti Virus from that PC that solved the sending problem. But now the freeking PC wouldn’t receive now, it is like spooling the incoming mail and won’t let any in. Sometimes it receives and sometimes it dosen’t…
What is this PC tell me? I went to the exteme of puting a new c-mos battery in and reseting everytihng that was no help….
NEED HELP PLEASE >:`E