"Could not start kstartupconfig" message appears at startup
 

I am a total beginner with Linux so please forgive me for my absolute lack of knowledge!

A friend recently partitioned my hard drive then installed Suse 10 onto my Computer

The first time I used it, I noticed that my friend had used my first name as the username, except that he had spelt my name wrong. I immediately went looking for a way to change this and was successful until the next time I went to use Linux (quite a long time afterwards).

Note: My friend set the username as johnathan. I changed it to jonathan.

Now, Whenever I boot up and select Suse, the following message appears:

Authenticating johnathan

A critical error occurred
Please look at KDM's logfile(s) for more information or contact your system administrator

After acknowledging that message, the log-in screen appears. Then after I put in my password, the following message appears:

Could not start kstartupconfig.
Check your installation

I have searched the internet for others with this problem but with no success.

PLEASE HELP!

Exactly how did you change it?