Short story - went to a free online movies website and it just goes automatically to a new page and the display is like a My Computer folder and it shows graph downloading Virus! so i quickly click back and i think the virus is already goes in..

So what happen now is:
- my window asking me if i want to block it but the button cannot be click(off mode),only the enable protection button can and it just open a www.perfectdefender.com( software ) which ask me to download.. And window says ( WIN32BRONTOX) WHICH I THINK it is the virus name ..
then after download only can scan! can't erase need a registry key to buy(marketing!!) And the window panel keep coming up every 15 min after i close it..

So after scanning with the perfect defender it says i have 7 Threads!
1.Win32brontox
2.Spyware
3.Spyware
4.dialer
5.trojan
6.hacktool
7.packed


So what it does to the computer now is:

- ( only the window keep appearing asking me if i want to block the win32brontox which i can't and other button is the enable protection which only goes to the www.perfectdefender website and the other that happen if im watching online movie from this online movie website (not the website i got the virus from), it will close all internet explorer after a few minutes(like a folder coming out saying the explorer is error need to be debug/close)

- Then if i want open website it says not recommended to this website, open hotmail usually goes through right away with Remember me password ,now it goes to homepage which i have to type in email and password,where i usually not)


My antivirus has expired longtime ago,as can't be bothered to buy a new antivirus where it's so expensive now

So basically what i should do now?
is there other way beside reformat?
is it safe to play the computer online?open like email or anything with password? My window firewall is on ,only antivirus is expired

i know nothing about computer, any help will do

Appreciate the helps