War2combat, does it have virus'?

my computer has a virus called malware defense ( a fake antivirus program ) it won't let me download any new antivirus ssoft or let me run any scans. It makes my computer slow and it won''t do away. plus it says there are lots of other viruses and spyware on my computer ( which i don't know if it is true or not) but i want to get rid of them if there are so i want to erase everthing on my computer how can i do that?  forex robot