If you attempt to delete the "parent.lock" file and receive the "Cannot delete parent" error, try running Chkdsk as explained in this MS article>
http://support.microsoft.c
You may need your boot CD.
Main Topics
Browse All TopicsI am trying to install Mozilla Thunderbird email. I installed it and tried to connect it to my existing Thunderbird data and could not get it to connect si I did an uninstall and removed it then reinstalled the software now I get the following: "Thunderbird is already running, but not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system." I have tried a restart that does not work, I have removed the software restarted the system and it does not show, then reinstalled the software and I get the same message. I went into regedit and removed everything I could find that said Thunderbird still no good. When I display what is running using the alt, control, delete to bring us a display it shows nothing running. When I look at process I do not see anything related to Thunderbird. I just had to reinstall the system due to other problems and I am in the process of reloading everything.
Thanks for any help, John
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
If you attempt to delete the "parent.lock" file and receive the "Cannot delete parent" error, try running Chkdsk as explained in this MS article>
http://support.microsoft.c
You may need your boot CD.
Business Accounts
Answer for Membership
by: JonveePosted on 2008-03-22 at 05:11:13ID: 21185726
You may need to remove the profile lock file, as explained here>
Profile_in _use
"Profile in use":
http://kb.mozillazine.org/