my computor has been hacked by something so i wont be ble to go on as often as i have in the past, internet dosent work but minecraft online does, most liely i will send it in to a computor person to get it fixed and it will comeback, des, please do not give the job to someone else i wil stil be on every so often, thnaks Rabbi_Sababa
Go grab Malwarebytes AntiMalware and Rkill.
Yah, you probably have the Security Essentials virus. It will mess up your proxy settings so you can't connect to websites through your browsers. Natedog has the right idea. Google a tutorial of how to get rid of it from a different computer and download the software needed to a flashdrive.
Yeah i've had problems in the past with viruses like these. Try going in safe mode to activate these programs, as the virus may block them.
I have had that i had to go onto safe mode download it, use it once you do that it locates the infected/corrupt files or documents and then termantes them