Well, you have not mentioned the version of firefox. To check it out, click on 'Help' from the menu bar and click 'About Mozilla Firefox'. But Im sure you will have atleast version 3.0.3.
This issue normally occur when 'show my window and tabs from last time' is enabled. To overcome this do the following
1. click on 'Tools' from the menu bar and goto 'Option'
2. That will open the 'Option window'
3. Click the tab that says 'Main'
4. You will find the heading 'startup'
5. Below that you will find 'When firefox start', click the drop down that says 'Show my home page'. (Below that you will find 'Home page', if you would like to change the homepage you can change their itself
6. Now click 'ok' and reopen it.
NB. This steps are based on Mozilla firefox 3.0.3
To answer your second question about uninstallation failed, this issue happen due to log files or .dll files are missing hence the uinstaller could not be loaded for that file.
As an alternative download the following file (revo uninstaller)
http://www.revouninstaller.com/revo_uninstaller_free_download.html
(click on download revo uninstaller free)
You can then install revo cleaner on your system. After you have install this file, open revo by clicking from the shortcut from your desktop. You will find 'yahoo' in the list. highlight it and right click you will find, 'remove/uninstall' click it. You would not find a new window, select the one that says 'Advance' now follow the onscreen instruction to remove it. You can try this tool for any software that you are unable to remove it
Regards
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