Unhappy [Q] Hi mtk drivers /USB unable thlw200 connect

well all started when my screen is got crazy and now i try to flash with flash ool stock rom but i can't connec my phone to the windows
I alredy read guides and did all what they say and nothing work.
after instal all drivers and plug the phone the usb reconnect every 3 seconds on and off X 100, and the only thing i have in device manager is "unknown driver" reconnecting...so i can only flash rom in CWM but i want to make format to all my storage and then flash it with flash tool...
I try 2 use w computers / and 2 usb cables nothing works...any help please?