I need to install drapery rods into the wall around a window. Space is limited on where to fasten the brackets for the curtain rod. The place I need to drill holes to install anchors appears to be right where there is a metal stud. I need to drill 1/4" holes. My drill is not able to go beyond 1/8" deep or even less. What tools do I need to drill through a met al stud? Could it be some other problem. My drill is able to safely drill holes on other sections of the wall.

 

Just a good bit (for metal drilling) should do it
You're sure it's a metal stud?
To attach something to metal studs I use self tapping screws