Killian02... When you install a new version of LimeWire, and launch it for the first time, it will re-hash all of the files in your Shared Folder. This may take some time depending on the number of files, and your available resources, but it shouldn't take a half hour as you stated.

I've found, like ssolo8, that if you exit the first launch of LimeWire and then launch it again, its OK. Have you tried this?