Virus n admin prob

Hello,
Prob 1:) hi i am facing an virus prob i have surabaya and khatra and ghost virus n ma pc when i try to download antivirus from ma system it closes the explorer by itself

Prob:2) when i try to open my computer properties n control panel and firewall settings its not coming its showing this operation has been cancelled due to restrictions in effect on this computer please contact system admin but i dont have ne admin this is ma home pc i wanna remove those restrictions please help me out

Prob:3) when i open something adultist in explorer it comes gotcha a**hole and closes it what should i do reply me fast please i am TOTALLY PISSED OFF