Lilly,
If you are really serious about wanting some help, please take the time to provide some information about your computer, what type, speed, memory, what operating system, what service packs, what updates. Do you have spybot installed, if so what version, when was it last updated. Do you have an antivirus program, what brand, what version, when was it last updated. Do you have a firewall, if so what brand, what version?
Was there anything significant about when the problem started, was it after you upgraded or installed any particlar program. The more information you provide the more likely it is you will some meaningful help.