First off calm down. Second don't let your little brother use your computer to "looking for a way to watch free movies on the internet".
1. Backup all files to a external hard drive. DON'T copy any of the system files, just pictures and stuff like that.
2. There are many other anti-virus programs out there, but many viruses are beyond them. I would reinstall (completely erase the drive), it will be the easiest solution without taking it to a "tech" guy.
People get bent out of shape about reinstalling. It is supposed to be done every year anyways.