try this..

your task manager and folder option and msconfig is ben disabled by malicious software, try to download re-enable portable it is free it will help you to enable the taskmanager, msconfig and folder option, after u downlaod this software install it and after u install, just try to press cntrl+alt+del and u will see the task manager in task manager go to process tab, in process tab u will see the programs that runing in ur pc.. u me now disabel the unknown program that running in ur pc.. after that download hijackthis and noobkiller it will help u to kill the unknown software that runing in your registry.