One thing about sales people - some are not so technically
aware, especially those big MNCs like Harvey Norman.
Here's a small little test I did at Harvey Norman.
Me: *see specs*. Laptop is good. What is the OS ar?
Salesman: Vista Home Premium.
Me: Got Vista Business or Vista Ultimate?
Salesman: Vista Business is for business. No Ultimate.
Me: Vista Business is not for business.
Salesman: It's for business.
Me: Haizz... OK. Don't want buy liao.
For the curious, Business Enterprise is for businesses. That's the
version that has to be bought from MS and validated against MS
servers.
Those in Sim Lim will know better... but there are some who will
try to cheat you.
One nearly had his trick work, but too bad, he got the wrong user.

Salesman: Miss, this spec is good. Duo Core 2GHz, Vista Business,
lightweight, 2GB of RAM.
Me: No no, this one Duo Core only, I want Core 2 Duo.
Salesman: Wah, you know.
Me: -_- ............
First thing to check is always their brochures. Some always
recommend, but don't know the specs well and will try anything to
get you to buy.