[Justified]

So I have a question and I put it here because it has to do with missing files on our computer or at least I think it does. These programs that people are making for yahoo messenger, most people are saying they are missing a file . These are my questions :

1. The files that are missing are they missing because some of us have older computers?

2. We have deleted a program we thought we no longer needed and mistakenly erased them in the process?

3. Or are they files that when the program was created , the creator himself left out ?

I'm asking because when I run SFC / scannow it doesn't tell me I have any files missing . Yet when I go to run one of these programs I get an error that some file is missing and I always have to get a copy of the file and put it on my computer.

If anyone has any answers to these I would appreciate it .

Thank you