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Download, install and run the BOINC software used by PrimeGrid.
When prompted, enter the URL:
http://www.primegrid.com/

If you are not using graphics enabled BOINC client, you may use manual registration form.

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If your account's email address is no longer valid

If you have run BOINC under the account, you can access the account even if you don't know the password and the email address is no longer valid. Here's how:

Go to the BOINC directory on your computer (on Windows this is usually C:\Program Files\BOINC.
Find your account file for this project; this will have a name like account_lhcathome.cern.ch.xml (where the project URL is http://lhcathome.cern.ch).

Open the file in a text editor like Notepad. You'll see something like

<account>
    <master_url>http://lhcathome.cern.ch/</master_url>
    <authenticator>8b8496fdd26df7dc0423ecd43c09a56b</authenticator>
    <project_name>lhcathome</project_name>
    ...
</account>

Select and Copy the string between <authenticator> and </authenticator> (8b8496fdd26df7dc0423ecd43c09a56b in the above example).
Paste the string into the field below, and click OK.
You will now be logged in to your account; update the email and password of your account.

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Generated 19 Jul 2008 23:36:07 UTC