WIFI problem HELP PLEASE

I turned my Vista laptop to XP loaded all the drivers and everything worked fine. Then a month later I changed the WEP to WPA2 to be more secure and it worked fine but then it started acting gay and I couldnt even connect. So i restarted the router to defualt settings tried the WEP key and it aint work and the laptop cant connect at all. I know the router works becuz i connected to it using another laptop and I know my wifi card works in the laptop becuz I connected to an open network easily,
I have an HP G60t-200
the wifi card is an Atheros 5007
Can someone help me please?
Answer #1
Make sure you’re re-entering the correct WEP key into the laptop, not using a stored one. Try connecting to another encrypted network, maybe a friend’s. If that doesn’t work, try a hard reset on the router, usually a hidden button on it somewhere.
Answer #2
Did it all already and nothing happened.
Answer #3
WPA is quite a bit more resource intensive and some of the early implementations of it had some difficulty in keeping up, resulting in infrequent disconnects how is the reliablity on no encryption? did you check to see if neighbours are on the same channel as your wireless? maybe someone next door got a router or changed channel to yours, that would explain it straight away look at your nearby strongest AP’s and choose a channel at least 3 away from it, and i think you will find it will be much better
Answer #4
Nah I changed it where its just Im the only one using the channel in the neighborhood. I still cant get it to work though any thoughts?