Wireless internet work on MAC's but not on the PC's

Question

I just bought the time capsule recently, set it up and all that good stuff. I have two MAC's connecting wirelessly with on and off speeds. I also have two PCs with wireless card. Before time capsule i was running on a Linksys WRT54G and the wireless worked fine on both MAC's and the PC's. The problem i am having is that the internet on the PC's are always down. I would have to go through the diagnostics test or making the internet come back to life with renewing the IP's or clicking "Repair". When it does work it works fine, then couple hours later the internet dies. It is never connected. Where as on the MAC's it is perfectly fine anytime. Before on the Linksys i could have my PC's up 24/7 and the internet wouldn't die. Any suggestions or tips? anything please. THANK YOU!
running from the DSL PPPoe directly to the time capsule through WAN port.
Connection : ALWAYS ON.
Wireless Security : WPA/WPA2
Channel: 1(Automatic)
Radio Mode : 802.11m (802.11b/g compatible)

Answer 1

I have had a couple of occaisions where the WiFi on my Macbook Air got in a knot. It seemed to come good after power cycling the router.
You could try removing your network from the computer and then adding it back again.
System Preferences > Network > select WiFi > click Advanced > select the WiFi tab > click the name of your network > press the minus button to remove it. Then add the network back again.
Hope this helps - Mark