1. Copy and paste this code :
@echo off
echo ipconfig /flushdns
ipconfig /flushdns
echo ipconfig /release
ipconfig /release
echo ipconfig /renew
ipconfig /renew
on your note pad or any other text editor
2. Save the file as : rapidshare.de.bat and leave it on your desktop
3. Every time you download from rapidshare double click on it!