There are many reasons why it could have this problem. Here's some stuff you can try:
1. Make sure that you are using the same security system. WEP, WPA, or WPA2. There's also the WPA personal, WPA2 personal, etc. Since, I dont have any more info about the hardware/software configurations you have, then.. I'll advise you to try all of them. For best results, I'll advise you to use WPA or WPA2 as your security system (change this on your wireless access point). After you choose WPA or WPA2, you'll notice that you might have 3 more options. using TKIP, AES, or TKIP+AES. If I remember correctly, TKIP+AES and just AES might cause problems with certain hardware, so I'll say, try using WPA2 and TKIP or WPA and TKIP first, then you might want to try TKIP+AES.
2. I'll recommend you to go to the linksys tech support webpage and download the latest firmware for your wireless access point. Some older firmware are buggy and would usually wont work with other brands..
I hope that made sense, since I'm at work and cant properly reply right now 🙁