The annoying part is that they still need help with a lot of stuff but now all I can say is "no, I just don't know." I used to be able to figure out just about

The annoying part is that they still need help with a lot of stuff but now all I can say is "no, I just don't know." I used to be able to figure out just about anything they wanted help with, be it how to program the video or set up windows just the way they wanted or in worst case write a program that solved whatever for them. Now I just feel stupid. What happened?