USAFRet :
From that description, it is impossible to suggest a 'fix'.
1. What OS? Win 8 or 8.1?
2. Where did it come from? Preinstalled or something you bought and installed?
3. Desktop or laptop?
4. Do you know the password and its not working, or do you just not know it?
5. When did this start?
6. What was the last thing you did before this happened?
7. What exact error messages do you see?
1. I got windows 8.1
2. i download something and then i realised that that file installed some ad things (webbars and shit) he installed my driver c:/ so theres no place and then a window popped up and closed instantly about 8 times, after that i tried to open c:/ driver and the error message popped up "C:/ is not accessible - access denied."
3.laptop
4.i know the password, its working and i got the admin rights
5.when i installed something (about a week ago)
6.installed something
7."C:/ is not accessible - access denied.","access denied" and "Windows cannot access C:/..."
its ok to lose some data to fix the issue.
i tried to change the settings for the driver C:/ but it came "Access denied"