Windows xp cannot connect to internet

Hello, I am running windows xp sp3. My friend accidentally downloaded a fake malware protection program called "Best Malware Protection". I still had an internet connection and downloaded Norton Power Eraser. I used the program and deleted the Malware and 5 other programs that I didn't recognize. After this process, I could connect to my internet, but not browse the internet. The internet diagnostic says that my firewall is to blame, but my firewall is turned off and I have excepted the FTP, HTTPS, and HTP ports. I have tried multiple fixes, but nothing works. Please help!