The error message is very clear and only indicates 1 thing: Not enough memory reserved for PHP.
This is not related to diskspace in any way.
Just edit your php.ini and assign at least 32 or 64Mb to PHP like already advised in the 2nd post in this thread.
For further advise please post in the server configuration forum on vB.com.
did you read the entire thread? i don't think you did.
my reply about disk space was not related directly to that error.
and i agree (as stated above) she should ask for server configuration advise over at vbulletin.com. especially for help with her cpu usage being at 100%.
anyway, sorry for getting involved. i had some downtime yesterday between meetings and thought i would read some threads in here.