The uninstall program should have asked you if you wanted to keep your existing saves and settings.
Each saved game is a separate subfolder in the '
..\Divine Divinity\Run\savegames' folder.
What point in the game were you? What class / gender? If the saves are gone, maybe you can get a save from someone else at a similar point, so you do not have to start over. I have saves from a male warrior, but the game was started under v1.29, so is missing some of the story fixes and changes from the 1.34
patch.