Trying to install, but being met with "failed" message

Hey, can someone help me figure out why I’m getting the following result during the installation:

http://img504.imageshack.us/img504/8862/modxl.jpg

Thanks in advance!

You have to set the files/folders mentioned by the installer to be writable.
This can be done via the most ftp clients.

Greetz
JUSI

Thanks.