"no disk space" with 25gb free!

pls tell me what to do
i have installed boinc on d: drive with 25gb free out of 76gb capacity
tried playing around with preferences to no avail

19/12/2005 5:54:50 ìì||request_reschedule_cpus: project op
19/12/2005 5:54:58 ìì|Einstein@Home|Sending scheduler request to http://einstein.phys.uwm.edu/EinsteinAtHome_cgi/cgi
19/12/2005 5:54:58 ìì|Einstein@Home|Reason: Requested by user
19/12/2005 5:54:58 ìì|Einstein@Home|Requesting 8640 seconds of new work
19/12/2005 5:55:01 ìì|Einstein@Home|Scheduler request to http://einstein.phys.uwm.edu/EinsteinAtHome_cgi/cgi succeeded
19/12/2005 5:55:01 ìì|Einstein@Home|Message from server: No work sent
19/12/2005 5:55:01 ìì|Einstein@Home|Message from server: (there was work but you don't have enough disk space allocated)
19/12/2005 5:55:01 ìì|Einstein@Home|Message from server: No disk space (YOU must free 39502.2 MB before BOINC gets space). Review preferences for minimum disk free space allowed.