Yesterday my email was working great and then I started getting this error

Unable to send or receive messages for the Live (tykatsmom) account.

Server Error: 4402
Server: 'http://mail.services.live.com/DeltaSync_v2.0.0/Sync.aspx'
Windows Live Mail Error ID: 0x8DE00002

Can someone explain the meaning - I have tried rebooting several times but the same error still comes up -

I am not at all computer person at all - but try my best.

I have done everything known to try - downloading a new virus scanner and no problems - HELP PLEASE

 simple instructions and telling me is the best thanks for your help

Germaine