Problems with Conncetion to Internet

2 days ago i was playing a game when suddenly my screen turned horizontal patterns all fuzzy and broken up. i then rebooted my computer and wasn’t able to get on. then i scanned my computer with ad-aware for spyware and so on, then it poped up, trojan, on my mcafee, then i scanned it and found 3 others on my local documents. i tried so many things but couldn’t fix this problem so i reinstalled my computer. after that i installed my virus protector in case if i was to get on they would hit me again, and tried to get online and still couldn’t, for short….. i have reinstalled my computer after getting hit with torjans, and am not able to connect online, can someone help me?