Hoping someone can help me out. Have been running SETI@home on my main PC since 2008 and that is running fine. I have started using my laptop more recently so decided to install Boinc on that too and attach to SETI project. Unfortunately, the Boinc manager on my laptop reports it requires 32Mb of space and 0.00 is available. This means there is constantly no work to process. The laptop hard drive is only 40Gb and about half full so there is plenty of space. I have left all the settings as per default when installing but can't figure out why the manager reports no space on the drive when there is nearly 20Gb available?? Must be a simple error but I can't see it any help much appreciated.

Boinc 6.12.34 on both machines
Win 7 ultimate both machines

You've probably got your local preferences enabled, which override the web-preferences. Clear them: BOINC Manager->Tools->Computing preferences->Clear.
That way the web-preferences will be used again.

If you still have that problem, check that you're using the right venue for that computer, that you changed the preferences on the right venue and what those values actually are. There's always 3 of them under the Disk and memory options section:

Disk: use at most X GB
Disk: leave free at least
Values smaller than 0.001 are ignored Y GB
Disk: use at most Z% of total

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kinda hoped it was a simple fix...

have knocked off the local preferences on both machines as suggested, then went to web interface to setup general preferences, then sent Update command from both machines all is now well.

Thanks to Ageless for the pointer