Uninstalling/reinstalling the Thunderbird program will probably have absolutely no effect on your mail account. re: I installed Chrome and believe that cause a problem with Thunderbird. What would make you think that as they are two unrelated programs? What issues are you experiencing? Chrome program is a browser and that is an entirely different program to Thunderbird which is an email client. If you had set Chrome as your default browser, then clicking on a link in an email would open your preferred browser. '''re :my Yahoo mail is messed up''' This does not offer much info. Are you talking about a pop or imap mail account? What do you mean by 'messed up' ? What are trying to do and what is happening? If you are getting any error messages, what do they say...word for word?