An email? Probably spam, what was the email about and did you click anything in it?
This sounds more like a problem with the connection. How do you connect to the Internet, broadband, DSL or dial-up?
How much installed memory is there, (RAM) ? What is your operating system and service pack?
Try running the Virtual Technician first to see if it fixes anything: http://mvt.mcafee.com/
Normally I would suggest you contact Technical Support by phone or online chat but they are closed for the weekend in your area.
(Linked under Useful Links at the top of this page, it's free of charge).
If the above doesn't help then try the long method by uninstalling everything via Control Panel > Programs > Uninstall a Program (Vista/Windows 7), Add or Remove Programs (XP)
Run the MCPR cleanup tool listed under Useful Links at the top of the page, reboot and then reinstall from your online account.