Can't install SH5 after deleting SH5 v1.2

[pariahjaide]

Hi all, I have a problem, my system crash due to a power outage and since then i can't play SH5, so I tried to uninstall it, i got an error message which basically said no you cannot uninstall the game. I got a little frustrated and decide to delete the folders manually. Well Now as I try to reinstall SH5 it is says I still have version 1.2 on my PC and will not install version 1.0 (from the CD) until I delete the previous version. I think I am missing a file to delete but I am not sure where to look I even tried deleting the game launcher and the SH5 from my registry. I would appreciate any help with this. Thanks.