OK
This definitely sounds like a configuration issue.
From the laptop click: Start, Run.
In the dialog box type: cmd
A command prompt window will open. At the command prompt type ping 192.168.0.1
Copy the output and post it to the thread by selecting the output with your mouse the clicking the little black icon in the top left of the menu bar and selecting: edit, Copy. Then in a post press: ctrl+v.
Then in the command prompt box type ipconfig /all and copy and paste the output into a post as above.
That will let us know what is happening on the laptop.
A possible cause of the laptop/PC problem you describe is that most laptops use 802.11b WiFi cards - ie 11Mbps, whereas the DG834G is an 802.11g router ie 54Mbps.
Now what happens is that if the router is set up to use 802.11b&g (Default) it will switch down to 802.11b. If the PC'S WiFi card is an set to run at 802.11g then when the router switches down it will drop the link.
The solution may be that if the desktop's wifi card is Netgear equipment, to reconfigure it to use 802.11b&g, which is a settting on Netgear equipment.
HTH
EG