Lets have fun with DOS commands...
The Instructable here is not really an Instructable, more some good fun.
Lets get started!

Hint: I will use Error 693 as a example error code.

Will make updates

Step 1: Some Good Error Message Tips

DO:
Use error codes e.g. error 693
Use C:\, D:\, E:\ etc. in front of all file names e.g. C:\ MS WORD
Use Caps for error messages and program names e.g. ERROR 693: FILE CORRUPTED,
C:\ MS WORD
DON'T:
Use I, Me or you (Do not: ERROR 693: I don't think me and you get along nicely.)
Make it sound like a conversation (Do not: C:\ hi{}HI{}C:\how are you?{}GOOD) the {} stands for new line

So, Using what we learned here...
C:\ MS WORD
ERR 404
C:\ MS POWERPOINT
ERR 404
Processing...
ERROR 693 MS WORD CORRUPTED MS POWERPOINT CORRUPTED
DOS WILL NOW SHUT DOWN
##########################
OR...
C:\Internet Explorer 2
EPIC FAIL
C:\Internet Explorer 2
EPICER FAIL
C:\Internet Explorer 2
WORSE FAIL
C:\Internet Explorer 2
SHUTDOWN
...
...
...
##########################
Will make updates

Step 2: Standard Nerd Codelines

These codelines will make you feel like geek, nerd or dweeb of the class and hey, I like that feeling.
DO:
again, use c drive d drive and so on alot
when using a computer AI response use caps e.g. SYSTEM FAILURE
use Lc for predetermined phrases e.g. Insert Boot Disk

DON'T:
use Lc on AI responses
write it like a conversation e.g. Hi{}HI{}How are you{}GOOD
use Caps for predetermined phrases

Insert Boot Disk...
Boot Disk Download... Please Wait...
Download Complete...
Looking For Boot Server...( Press F8 For A List Of Boot Servers)
Novel Boot Server 1997 Found...
Uplink Complete...
___________________
C:\ RUN
RUN WHAT FILE?
C:\ MS PAINT
FINDING MS PAINT...
PROGRAM FOUND...
RUNNING MS PAINT...
RUN ERROR 693...
PASSWORD REQUIRED...
SW:\ ****************
ERROR CORRECTED...
RUNNING PAINT...
WARNING! DOS FAILURE! SHUT DOWN IN 5
4
3
2
1
DOS SHUTDOWN...
#################

Thats a farily authentic little Codeline, isn't it?
Will make updates