Hey Lagu,
I think the default boinc setting are around 100GB of disk space as found in the boinc/options/preference/disk usage . Turn is way down to something more reasonable to your setup. I.e. 500-700mb

"When I first joined I had the same problem... My computer has 30gig of space, so it wouldn't download any work. Because the phrasing of the option is so confusing I kept on trying to add more space in the preference, wondering what sort of project would use 500gigs. Only when I turned it down to less than the ammount of free space I had on my HD did it start to work."

Now, if you take into consideration that 1)most people don\'t have a 100Gb of free space and 2)all that required messing around with the settings may distract and discourage new users and 3)at the end of the day Cosmo doesn't use near that much - one wonders why that setting doesn't have a default of say, a hundred meg only.

Anyhow, preferences may be defined for up to 4 specific \"locations\". When viewing your general preferences are there any preferences shows for any of the specific locations, school, work, home? And at the very top page of the messages in the BOINC messages tab, you will see two messages such as this:

11/20/2007 2:40:09 PM||Host location: none
11/20/2007 2:40:09 PM||General prefs: using your defaults

So your computer might think it is \"home\" and use preferences for \"home\", but the preferences you reported might be for \"default\".

You could have a corrupt .xml preference file also. You could remove boinc and re-add so a new .xml preference file is created . Just a idea.