Once i installed a software called winthruster my pc is no longer able to open files...as soon as i click on a file it says "device not ready" in a dialog box...i thought of refreshing pc (i have win 8) it took almost a hour and said "cant refresh pc" i still took breath and tried to reinstall windows ...i could not install by clicking on setup as it says device not ready(already told) ..so i thought of using bios .but problem is that i had set a bios password and i dont remember it...also whenever i open my pc it directly opens desktop instead of windows menu that we see in win 8...also there is just a task manager and a black background desktop...i am helpless plz someone help me !