If a hacker gets into my PC can he steal my emails passwords? I use the windows live mail client to manage my email and I have saved my passwords when it asks me to save them. I run like 9 mail accounts and don't want to enter the passwords each time I open my PC.
Yes, but if a hacker gets into your PC, he or she can also install a keylogger that records everything you enter, so even if you did enter your passwords every time rather than saving them, you still wouldn't be safe.
The best advice is to practice safe computing and don't allow yourself to be infiltrated in the first place.
The next best advice is that if you're already past this point, or at any point determine that your system has indeed been compromised, Nuke It From Orbit, re-install and rebuild your system from the ground up. This is the only way you can reasonably guardsmen it will be clean again.