Astrill Setup Manual:How to flush DNS cache on Windows XP
STEP 1 - Run Command Prompt
1. Click on Windows Startup Menu and navigate to the command prompt (All Programs > Accessories > Command Prompt)
2. Make sure that you Right Click on the command prompt application and choose "Run as Administrator" to run command prompt.
STEP 2 - Flush DNS cache
1. In the command prompt, type in ipconfig /flushdns then press Enter key.
2. This is a confirmation that you have Successfully flushed the DNS resolver cache.