Imac and Macbook Pro suddenly stopped connecting to my wireless network

I am having the strangest problem. I've had a linksys router for years and my network has worked fine. I have a 2008 iMac, a new Mac Book Pro, Xbox 360, and a PS3 connected to it. Yesterday, the Apple products stopped connecting to the linksys, however the Xbox and PS3 connected fine. I thought it was my router being the problem so I went to Apple Store and bought an airport express to just set that up as my primary router. I could not set it up the normal way wirelessly as neither my iMac or MBP would pick it up via the Airport Utility tool. I had to hardwire it to my iMac to get it set up. It seemed to not be working however the green light did eventually come on. My xbox connected to it fine, however the iMac and MBP would not connect. Both did end up connecting but only for a short time and now neither can find the Airport Express. Does anyone have any suggestions as to what my problem is? It just doesnt make sense that both mac computers stopped picking up the linksys at the same time, and neither will really pick up the Airport express either. I'm just so distraught over this because I had everything working fine such as sharing files, wireless printer, Apple TV, etc.

Hi there, I have exactly the same problem, one year with imac and a few months ago my wireless network disconnected and kept disconnecting and connecting on and off, it's not the Internet because laptop and other aps are ok
Today I tried contacting Virginmedia to see if they could help and they told they are not trained for mac! Anyway they suggested to try to use the "renew DHCP lease" button in the TCP/IP page in network settings and it seems it is working better now, lets see if it lasts...

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