If there is need to run Feedreader from USB flash memory then you must do following modifications to Feedreader installation:
1) Move feedreader.ini from folder c:\documents and settings\USERNAME\application data\Feedreader\ to the folder where Feedreader application files are located (initially c:\program files\Feedreader30).
2) Create folder named DATA inside the folder where Feedreader application files are located (eg c:\program files\feedreader30\data).
3) Move rssengine.fdb file from folder c:\documents and settings\USERNAME\application...