Sorry, bad habit of me to edit - read the link, please.
Make a new clean install, check that you have admin right.
Backup older saves in an extra folder.
Delete the game.
Reboot/defragment/reboot
Install CD-ROM (1.29) and 1.34 - the new patch.
No background programs should run during install
don't let the support site fool you, the download info will be updated, the patch is there since 2nd May (10.3 MB).
Then load one of your older saves into the game (1.29 -1.32), NO saves you have made with 1.33.
Play.