Emails Not Received By Recipient

Whenever I send out an email with a picture or any kind of attachment including word documents through Windows mail, it says the email was sent, but it isn't being recieved by the recipient. Then I get a Norton symantec pop up saying this problem does not occur often, their support team have not been able to reproduce the error, and it also says that the error message is actually caused by a problem on the cpu itself. When I clicked the "run it now" button to run a Symantec administrative tool it states that I must be logged into an administrative account to complete this action, but I am! The only info it gave was this: Module 1003, Error ID 9, Build Symantec. I have Norton Antivirus 2007 and I ran a full scan and I don't have a virus. I'm about to throw this cpu out the friggin' window! Is there anyone out there who knows why it's doing this? My last resort is to bring it in to the geek squad to see if they can fix it.