NVIDIA 9400 GT not recognized as a CUDA device

09.02.2009 13:28:34||Starting BOINC client version 6.6.4 for windows_x86_64
09.02.2009 13:28:34||log flags: task, file_xfer, sched_ops
09.02.2009 13:28:34||Libraries: libcurl/7.19.2 OpenSSL/0.9.8i zlib/1.2.3
09.02.2009 13:28:34||Running as a daemon
09.02.2009 13:28:34||Data directory: C:\ProgramData\BOINC
09.02.2009 13:28:34||Running under account boinc_master
09.02.2009 13:28:34||Processor: 4 GenuineIntel Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz [Intel64 Family 6 Model 15 Stepping 11]
09.02.2009 13:28:34||Processor features: fpu tsc pae nx sse sse2 pni
09.02.2009 13:28:34||OS: Microsoft Windows Vista: Ultimate x64 Editon, Service Pack 1, (06.00.6001.00)
09.02.2009 13:28:34||Memory: 4.00 GB physical, 8.17 GB virtual
09.02.2009 13:28:34||Disk: 232.88 GB total, 137.61 GB free
09.02.2009 13:28:34||Local time is UTC +1 hours
09.02.2009 13:28:34||Not using a proxy
09.02.2009 13:28:34||No CUDA devices found
09.02.2009 13:28:34||No coprocessors
09.02.2009 13:28:34|climateprediction.net|URL: http://climateprediction.net/; Computer ID: 869112; location: (none); project prefs: default
09.02.2009 13:28:34|Einstein@Home|URL: http://einstein.phys.uwm.edu/; Computer ID: 1365211; location: home; project prefs: default
09.02.2009 13:28:34|SETI@home|URL: http://setiathome.berkeley.edu/; Computer ID: 4376769; location: home; project prefs: home
09.02.2009 13:28:34|SETI@home Beta Test|URL: http://setiweb.ssl.berkeley.edu/beta/; Computer ID: 38557; location: (none); project prefs: default
09.02.2009 13:28:34||General prefs: from SETI@home (last modified 07-Feb-2009 14:40:40)
09.02.2009 13:28:34||Computer location: home
09.02.2009 13:28:34||General prefs: using separate prefs for home
09.02.2009 13:28:34||Reading preferences override file
09.02.2009 13:28:34||Preferences limit memory usage when active to 1023.56MB
09.02.2009 13:28:34||Preferences limit memory usage when idle to 3684.82MB
09.02.2009 13:28:34||Preferences limit disk usage to 100.00GB
09.02.2009 13:28:34|climateprediction.net|Restarting task hadam3h_g_063s2_005a_005a_0_4 using hadam3 version 601
09.02.2009 13:28:35|Einstein@Home|Restarting task h1_0498.90_S5R4__261_S5R5a_1 using einstein_S5R5 version 301
09.02.2009 13:28:35|SETI@home|Restarting task 08ja09ak.26334.4571.5.8.175_0 using setiathome_enhanced version 603
09.02.2009 13:28:35|SETI@home Beta Test|Restarting task ap_03no08aa_B5_P1_00314_20090208_14664.wu_1 using astropulse version 501
09.02.2009 13:31:13|SETI@home Beta Test|Sending scheduler request: Requested by user.
09.02.2009 13:31:13|SETI@home Beta Test|Not reporting or requesting tasks
09.02.2009 13:31:18|SETI@home Beta Test|Scheduler request completed: got 0 new tasks

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It's most likely because you're running Vista and have installed Boinc as a service in Protected application Execution mode, which is not able to use CUDA. If that's the case you'll have to uninstall Boinc and reinstall it. You can use the guide on this page to install Boinc in Vista to assit you.
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Yes, that´s it!
thx

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