[Q] Problem connecting nexus 7 on windows 8.1 topic

Sorry if this has been ask before, but i search the entire web even xda and honestly didn't find any answer for my problem.. so here it is, i have the nexus 7 2014 with android 5.0.2 and everytime i try ti connect the device to my computer (running windows 8.1) it won't recognize it, i tried everything, installing the adb drivers, the sdk manager , and nothing, it won't show up on my computer to even manage my sd card (internal memory in this case) i try connecting the device with and without debug mode, and nothing..i want to root my nexus 7 by the way..the computer device manager everytime shows me on the list the nexus as "other devices - nexus 7" and on the same other devices tab also shows and unknow device tha dessapears with the enxus when i unplug it from my computer, oh and both are shown with an yellow triangle with an exclamation sign..so you tell me, please help! i dont know what to do..and don't tell to install windows 7, because i have it before and yes is better, but i went full retard and install windows 8.1 (i kinda like it though) so there's gotta be a way to make it work the nexus with debug mode on and finally root it :(

sorry for my bad english bla bla bla