Broken after updating to Thunderbird 5

After upgrading to version 5 it no longer works. I Cannot get mail! All accounts have been deleted. I Cannot add them in again. Under account settings (all blank)! Clicked on account actions, add mail account, nothing! History, during installation all .dll files would not install. I clicked ignore on all of them. I have re-installed the software again still the same issue all .dll files would not install! This time I manually renamed the files that it wanted to install. Same issue program is dead?

Any help would be great! Thank you in advance!

[Title changed from "Mozilla Thunderbird Portable Edition" - mod Chris]