One laptop sometimes can't see wireless router/DSL Modem

[tuser]

Hello, Hope someone can help!
I have a 3com wireless Router / DSL modem that has served me well over the past 4 years.
I have two laptops and a desktop that connect to it wirelessly and usually have no problems.

However lately one of my laptops (Dell Lattitue D620) XP SP2 all updates will sometimes not see the wireless connection. The other two computers can connect with no problems and if I connect it via an Ethernet cable it connects fine.

The strange thing is that some days it will see the router and automatically connect with no issues, but other days (like today) it just does not show up in the wireless connections.

Any ideas??

Thanks,
-T

[Big_Daddy]

Are you hiding the SSID on the router?

[tuser]

No, the router is visiable to the other computers with perfect signal strength.

[Rootstonian]

Do you have any other devices (a new wireless phone perhaps) that is running at 2.4Ghz...that can disrupt your wireless network signal.