Are you using a web based e-mail or a computer based?
web based would be HOTMAIL or YAHOO mail,
computer based would be LOTUS NOTES or Microsoft Outlook.
If web based, you probably have a virus,
there is a good free scanner at this link:
http://www.pandasecurity.com/activescan/index/
If computer based, it is not that hard to un-install,
usually in the start menu for your program there is an icon for un-installing,
if not, go to the control panel and open "Add or Remove Programs"
a list of all your programs will come up
and give you options for removing.