Xperia X10 :: Connects But Can't Download Any Data?

My x10i suddenly stopped using the wireless, it connects but can't download any data.Then I found this post here:[URL]..I checked what he said:

I've upgraded my X10i to 2.3.3 Gingerbread recently. I've also installed various programs after that. Wireless was working fine till suddenly applications using the net ceased to connect or download over wireless. Mobile connection works ok but when I switch to wireless, net activity stops. I didn't change any setting on my modem (US Robotics). I also have an Android Pad which can connect through the same modem without any problem, also my wifes laptop doesn't have problems connecting. Then I tweaked further and discovered that my X10i can't resolve domains into IPs. When I use the website's IP to connect everything is fine. I can browse or download within the same website that I connected with its IP but if I try a link to somewhere else or try with the domain name the phone gets stuck trying to connect (surely at the domain resolving state). My local support told me either to use repair on PC Companion or change the modem settings to Wep (it's wpa/wpa2-psk currently) but I want to do neither cuz I can't change every modems setting I come across nor reset the firmware everytime with all my program installed gone to trash. There must be a clear solution, more likely a setting somewhere.

And that's exactly the same problem I have, I can browse when connected with IP addresses but not with domain names. Although my x10 is also upgraded to 2.3, I don't think that's a 2.3 problem. I too think that's a setting problem somewhere.