hail hail

my problem:

i have a p2/200 notebook (win98se) and to give its existance a meaning i installed boinc4.05 and joined cp.net, but:

each time i start boinc,

it connects -> OK
downloads -> OK
runs -> OK
after about 5 secs it stop with a computation error (unrecoverable error for result ... exit code -2) and tries to load new data.
during the second download, boinc crashes.

after restart of win/boinc: same behaviour until quota exceeded

what im i doin wrong???
the boinc-page says there are no restrictions to cpu-power.
i tried 8 data-set until now (size:19.45 kB each). why do the need 128MB HD-space?
i tried seti, but the server does not respond. i do not know if it´s a problem with my computer or of the boinc-client.

No support for win98.

I have this problem on a WIN XP computer, AMD 2500, 512MB RAM, 80 GB HDD. What is that "unrecoverable error"?