MY USB PORTS AND CARD READER WONT WORK ONLY ONE OF MY USB WORKS OUT OF THREE I

I HAVE THREE USB PORTS ONE ON RIGHT TWO ON LEFT AND A CARD READER ON RIGHT. ABOUT 4 MONTHS AGO I GOT VIRUS AND WENT TO RESET MY COMPUTER AND I STOPPED IT IN MIDDLE AND WIPED OUT MY WINDOWS 7 BUT I RECENTLY GOT MY WINDOWS 7 PROGRAM BACK BUT NOW THE TWO USB ON THE LEFT WONT WORK EVEN THOUGH IT SAYS ITS WORKING PROPERLY. THE USB ON RIGHT WORKS BUT ONLY FOR CERTAIN THINGS AND MY CARD READER DONT WORK EITHER. AND MY WEB CAM ONLY WORKS IF I WANT TO TAKE A PIX TO SEND IN A MESSAGE AND CHAT. I WAS TOLD TO DOWNLOAD THE APPLACTION FOR ACER . HOW CAN I FIX THE PROBLEM WITHOUT PAYIN FOR A PROGRAM