New Problems

So yesterday I downloaded the new beta and right away I am having trouble on the new and old versions. One of the first problems I've been having is after I accept a match in draft mode it crashes, in game I lag and my ping goes to crazy which hasn't happened before, in mid game it also crashes so I have to reload league and blah blah bam...time penalties, and now my "Webroot" virus control program is going ham when I open league. Please help me fix the problem or how to uninstall the new beta.

Thanks!!