Your email should be ok to use again. Change the password for any websites for which you use the same password. Never, ever, give your password or information a website that you are not 100% sure that you can trust. Many emails can contain a link to a carbon copy of a real website, for example paypal, of course asking you to sign in with your sensitive information.
You should educate yourself on how to stop viruses and worms from taking over your computer. Also, you may want to learn how to tell when an email from a friend is from a hacked account.
Some other tips to include- don’t sign up for any random websites. If you’d like to, then make a separate email account for spam.