xts zoo "cannot remove prior installation of package"

Hello,
Some how, my xts/zoo package ran into trouble. I tried to re-install the packages, I get an error that it cannot remove the prior installation.
I uninstalled R and the deleted all the libraries and reinstalled everything fresh. It still complains the same thing. I try to remove.packages("zoo"), it tells me there is no such package. I am really baffled. Does anyone know how to fix this problem?

Thank you,
Pooya.


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