Installing Root Certificate on Windows Vista & Windows 7 
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1: Download the Secured Signing Root Certificate

2: Double click on the Root Certificate from your download location and click Install Certificate.

3: In the wizard that pops up, click Next.

4: Choose 'Place all Certificates in the following store', click on Browse… and select Trusted Root
    Certification Authorities. Click OK, and Next

5: In the next window click Finish.

6: Choose Yes in the Security Warning window.

7: Click Ok to complete the installation.

Next Step: How to Enable Adobe Reader to Verify Digital Signatures.
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