I have found a solution to your problem, one that I myself acquired from another Libreoffice user. Simply run the installer for the latest version of 3.5 you have, click modify and custom installation. Uncheck all the dictionary extensions except for the language you wish to use. You might need some of the other languages but I highly doubt it. When you click install these will be removed, open Libreoffice up and it should be running smoothly once again.
Additionally, do take the advice on tweaking your memory settings. Under Options>Memory>graphics cache, increase your allocated memory for use in Libreoffice to max; 256mb. Reduce the number of undo steps to 30 and check load Libreoffice quickstarter. Under Options>Java uncheck use Java runtime environment. I hope all this helps.