Did you use mods in previous installation, and did you remove also those folders manually after uninstalling?

Any error messages?

Do you get up to loading the map and it seems to freeze on the black loading screen?

If so, then you need to be patient. The current version takes a looooooooong time to create new maps or update existing maps to a newer setup (as low as 3 and as much as 10 minutes have been reported so far). If you click the mouse or press a key while it's doing so, Windows will get confused and think that the game has frozen, throwing a "Ths program has stopped responding" error. Just let the game finish its work and don't touch anything until it does.

The good news, though, is that after a given map has been processed as above, it will load more quickly from there on out - generally about 5-30 seconds, depending on how much material is in the area you'll be spawning in at and how powerful your system (mostly what kind of drive you're using) is.