I bought my laptop from Galaxy Computers in Lahore. The shopkeeper is Urdu speaking, and even though I personally dislike the Urdu speaking community, I did not let my emotions take the better of me, especially so as I read some good reviews about the shop at this forum.
I was able to bargain a good price for my laptop, and happily bought it. The next day however I realized that the Ethernet device is not working. So as I brought my laptop back to the shop I found the shopkeeper's attitude change quickly to a pleasant person that he was previously pretending to be, to a very rude person.
After his support staff unsuccessfully tried to correct my problem, I finally realized I am better off taking my laptop back home, as I now felt sick of their rude attitude.
I am however fortunate to have corrected the problem later that day by just upgrading my laptop's bios. So the moral of my experience is that all shopkeepers are alike, and you should never trust any of them, expecially so if they are from the Urdu-speaking community
Keeping this mind I do not think you should have any problem buying form any computer shop in Pakistan.