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you will need to get a new certificate from the CA or create a new self signed cert if you are not using a CA.<br />
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You haven't specified your OS so its difficult to give a definite answer. Here are a few links to help<br />
<br />
<a href="http://windows.microsoft.com/en-au/windows-vista/request-or-renew-a-certificate" rel="ugc">http://windows.microsoft.com/en-au/windows-vista/request-or-renew-a-certificate</a><br />
<a href="http://windowsitpro.com/security/q-how-can-i-renew-certificate-my-windows-root-ca" rel="ugc">http://windowsitpro.com/security/q-how-can-i-renew-certificate-my-windows-root-ca</a><br />
<a href="http://technet.microsoft.com/en-au/library/cc726033.aspx" rel="ugc">http://technet.microsoft.com/en-au/library/cc726033.aspx</a><br />
<a href="http://technet.microsoft.com/en-au/library/cc730605.aspx" rel="ugc">http://technet.microsoft.com/en-au/library/cc730605.aspx</a>
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you will need to get a new certificate from the CA or create a new self signed cert if you are not using a CA.

You haven't specified your OS so its difficult to give a definite answer. Here are a few links to help

http://windows.microsoft.com/en-au/windows-vista/request-or-renew-a-certificate [http://windows.microsoft.com/en-au/windows-vista/request-or-renew-a-certificate]
http://windowsitpro.com/security/q-how-can-i-renew-certificate-my-windows-root-ca [http://windowsitpro.com/security/q-how-can-i-renew-certificate-my-windows-root-ca]
http://technet.microsoft.com/en-au/library/cc726033.aspx [http://technet.microsoft.com/en-au/library/cc726033.aspx]
http://technet.microsoft.com/en-au/library/cc730605.aspx [http://technet.microsoft.com/en-au/library/cc730605.aspx]

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certificate for local system with thumbprint is about to expire or already expired
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certificate for local system with thumbprint is about to expire or already expired

how to fix

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.