Frustration @ work

Boiling point is rising. I am so so angry that I really need to vent this out now.

A colleague of mine was asking for help.
"Can I see you at 5pm?"
It wasn't much of a question. It was more of a command though.
Just because it was URGENT for him, I had to put down whatever I am doing and and assist him only.
True to his words, he came over to my desk at 5pm.
"Lifeng, I need you to put this up for me....NOW"

What was really frustrating (on top of me doing him a favour when I could have said 'no, go get someone else' PLUS his authoritative tone aside) was this.
1) "Lifeng, why do you have the bla bla bla rights to this system? Who gave it to you?"
2) "why are you using this system? who installed for you?"
3) "what's that number on the paper? why so long? what is it for?"
4) "why the extra set of laptop?"
5) "why is your system so slow"
6) "why the network so slow on ur pc"
7) "can you reload it? it's too slow"
8) "who is this, what is that"
BLA BLA BLA BLA BLA... AND more BLAs
Hounding me while I was TRYING to do HIM a favour.

I must bowdown to him as I have not seen or experienced any guy as nosy, by the books, irritating and unappreciative.

Because of such people around, I learned
1) to appreciate things better,
2) appreciate the nice colleagues I have,
3) not to take things for granted, etc

God, thank you for teaching me the art of appreciation.
I pray hard that I can learn how to curb the ' very evil emotion - anger' in me too.