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Download, install and run the BOINC software used by PrimeGrid.
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http://www.primegrid.com/
Select which subprojects to run via the PrimeGrid Preferences.

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

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1) If you know your account's email address, and you can receive email there:

Enter the email address below, and click OK. You will be sent email instructions for resetting your password.

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2) If you forgot your account's email address, or you can't receive email there:

If you have run BOINC under the account, you can still access it. Here's how:

Go to the BOINC data directory on your computer (on Windows this is usually C:\Documents and Settings\All Users\Application Data\BOINC or C:\Program Files\BOINC.
Find your account file for this project; it 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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