Is there a problem with haylee? The last 24 hours have brought up hundreds of 500 internal server errors in my error log;

[Fri Mar 23 12:43:31 2007] [error] [client 86.130.93.203] (12)Cannot allocate memory: couldn't spawn child process: /home/special/public_html/aggregates/index.php
[Fri Mar 23 12:43:06 2007] [error] [client 86.130.93.203] File does not exist: /home/special/public_html/500.shtml

Is this something to do with the server load as that seems to be red on the status?