Is it possible to reload my "Watched" history after a reinstall?

I had to reformat my computer (Win7) and reinstalled Plex.
When I installed Plex and logged in all my libraries were gone. I re-added them but all Movies/TV Shows are marked as unwatched. I still have the Program Files folder from before the reformat and want to know if it is possible to get what i had previously marked as watched marked accordingly or if I have to remark them all manually?

I think if you follow the steps to ‘Move an Install to Another System’ you should get your watched status back.

https://support.plex.tv/hc/en-us/articles/201370363-Move-an-Install-to-Another-System

Once you do get your watched items set again, you can use trakt.tv and the plex-trakt-scrobbler plug-in to do this in the future.

Plex-trakt-scrobbler: https://forums.plex.tv/discussion/102818/rel-trakt/p1

After setting this up when you reinstall the server just install the plug-in again and pull the data from trakt and you will have everything marked as watched.

@Dibbsie said:
I still have the Program Files folder from before the reformat and want to know if it is possible to get what i had previously marked as watched marked accordingly or if I have to remark them all manually?
This will not help. PMS uses the Program Files (x86) folder. Even then, there is nothing saved in that folder regarding your library. You need the Plex Media Server folder that was in your old user folder. Here is an article specifically to copy/move the watched status from system to system. https://support.plex.tv/hc/en-us/articles/201154527-Move-Viewstate-Ratings-from-One-Install-to-Another

That install to another system method did the trick.
Will look to add trakt in the near future too
Thanks