There are a few questions:
What kind of cable do you use?
USB, SERIAL, PS2
What kind of computer?
Normal computer or Laptop?
Then...
When you recieve the scanner like new you always have to program it.
First you do
Reset to factory defaults.... Never do this with working scanners
then
you have to program it.
First the Connection type
and then if needed a computer type.
After that you usually have to scan a suffix.
This means when you scan a barcode it needs to do something after.
normally it doesn't give Enter after you scan.
That is what the suffix is for.
and then you scan additional symbologies to scan
Like Code 39, UPC A etc. etc.
It needs to be programmed with the manual you recieved.
if you don't have it you can download here.
http://www.scanning.datalogic.com/sitefiles/manuals.aspx
go down in the list to quickscan 6000
and programming manual.
please don't print all the pages. only what you need.
If you need more help i will hear it.
good luck.