WiFi problems on Macbook Pro

Ever since I upgraded to 10.7 I have been having major problems with WiFi. I'm running a MBP 2007 (or 08?) 2.4 Core 2 Duo with 4GB Ram with 10.7.4. The system cannot remember the WEP password. The system sees the network every time, but refuses to connect without me entering the password every single time, either after a restart or sleep. I click "remember password" and it NEVER does. When I go into system preferences --> network --> advanced ....it shows the network (only one in list) as a "preferred network" with the "WEP enterprise" (wireless N) and a key logo next to it.

Directly connecting to the router with a network cable works every time...no problems.

How can this be fixed? I've done a bunch of searching and I'm not seeing a real solution.

Can anyone help?

Go into your router and change the encryption to either WPA or WPA2 and enter a new pass word or phrase. Make sure you have an ethernet cable attached when you do. Then setup your WiFi access using the new encryption and pass word. WEP is not only unreliable it is also not secure.

I can't even get the MPB to connect to a WPA set network at all. It just keeps giving me "connection timeout" errors.

Turn off wifi, then repair your keychain (in Utilities), turn wifi on again.

I just tried this and did not appear to fix the issue.

Anyone able to assist further? I cannot figure this out. I repaired the keychain and it did nothing. Still having same problem.

Also, WiFi dropping at random times. Shows as still connected but its disconnected. I have to manually reconnect to get it working again.....entering the long alphanumeric code every single time.

What brand and model is your router?

Its a Belkin F5D8235-A N+ wireless router.

My iphone 4S has no problem connecting to the router at all.

turn off wifi, delete your network from the list of preferred networks, go to keychain, search for all entries of your network, delete them. reboot and the rejoin your network as if for the first time. that should do it.