Have two laptops and both can't see my own wireless network but it can see 4 other wireless network which belongs to other people.

I have a Motorola phone, Nokia phone, iPad & PS3 and all four of these devices can see my own wireless network and connect to it successfully.

I did do a windows update but I thought if that was the problem then why can it see other wireless networks and not my own?

My wireless router setting is set to B/G/N mode 
Have even tried moving the laptop next to the router even though I have always had it on my desk at the same location.

Anyone experienced this with their computers? 

Cheers
Tony