Running
Get-ChildItem -Recurse Cert: | Out-File -FilePath C:\a.txt
notepad C:\a.txt
should list the certificates in the personal certificate store, save the output to a.txt, and open the file in Notepad. If the file is still empty, it may indicate that there are no items in the Cert: drive or that there is an issue with accessing the certificate store.
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hth
Marcin