Ok, when I was in Thailand, it seemed like TOT continually had problems with their DNS. DNS resolve times would sometimes skyrocket and would be the biggest reason why the net was slow. As soon as I put these in, many of the problems went away.
Also, some of the most insidious bannings of site will happen when a provider, like True, removes the DNS listing for a site from their servers. The site disappears and you get the dreaded server not found error. Not so when you use OpenDNS. If you are in Thailand or any closed country then you really need to be using Open DNS.
Here is the Easy Info, use these for your DNS:
208.67.222.222
208.67.220.220
A larger overview:
1. Select Control Panel from the Start menu.
2. Click Network Connections from the Control Panel choices.
3. Choose your connection from the Network Connections window.
4. Click Properties button.
5. Select Internet Protocol (TCP/IP) and click Properties.
6. Click the radio button Use the following DNS server addresses and type in OpenDNS addresses in the Preferred DNS server and Alternate DNS server fields. (208.67.222.222 and 208.67.220.220 respectively)
Still need help? Here is help with screenshots of what you need to do:
https://www.opendns.com/start?device=windows-xp