problems with the new updates

hi everyone again, thanks for all the great answers to the latency issues. however, since raising the buffers to 512 the problem persists. my interface is Roland quad capture and i only use # 1 and 2 for in and out, i don't use "main" because somehow everything double tracks.
i have also installed ASIO4ALL and never notice any difference in performance so i stick with the default Roland settings.
i'm going to start a new project and if i have any more problems i'm going to want to uninstall the updates and fix's i need to know how i do this.
i've always found leaving the interface defaults alone things work fine. i never record more than 2 tracks at once and other than superior drummer and occasionally one of the stock soft-synths. i have no use for touch screen or melodine.
i wonder if i can get rid of the things i don't use my computer will work better?
i would appreciate any thoughts on this.