try using a different web browser until you can get things sorted out. They make redistributable installers for Chrome and firefox so you can DL it on a different computer, but install it to yours.
Then do the general first few things that you should do when you find a problem:
1) full virus scan
2) full malwarebytes scan
3) run CCleaner's cleaner and registry cleaner
4) take an asprin and sleep on it
Let us know if that fixes anything