Hi, I have used kazaa lite and now klr for the past 5 yrs. I installed the patcher just after it came out, and it really messed mine up bad! Mine was working, then I installed the patcher. (I figured it was an updater) My pc stopped connecting at that point, and it kept locking up doing nothing at all. My system uses win xp pro, sp2 so I ended up uninstalling it all, and running straight klr oo76f. Works fine now.