What do I say

Ahggrrrr....what am I doin here, if i ask these people to open internet explorer they open outlook express.
I try and explain them that we need to open IE they try to login to msn messanger.
If i ask them which operating system are u using ,I get the reply dell,HP,Compaq.
When I ask what do you see on the desktop I get reply -Grass,mountain ,tree.
When Iask them to switch off the comp's they just switch off the moniter
When I say D as in Delta ,I have no idea how do they hear B.I am sure I wouldn't have said B as in Belta.