this problem is also in 6 and 7.
this is a part of log:
（a chinese forum,you can see the log in 21#）http://www.equn.com/forum/redirect.php?goto=findpost&ptid=34768&pid=464166
and the BOINC manager displayed:you should tell administrator to add you to boinc_users
this problem happened in my two compter.so who can tell me how can I solve this problem？
Thanks[/quote][/code]

You can't have the Data directory in the Program Files Directory, it has to outside it (for security reasons), Normally for XP it is: C:\Documents and Settings\All Users\Application Data\BOINC\ and will be a hidden directory:

10-Aug-2012 08:29:41 [---] No config file found - using defaults

10-Aug-2012 08:29:41 [---] Starting BOINC client version 7.0.28 for windows_intelx86

10-Aug-2012 08:29:41 [---] log flags: file_xfer, sched_ops, task

10-Aug-2012 08:29:41 [---] Libraries: libcurl/7.25.0 OpenSSL/1.0.1 zlib/1.2.6

10-Aug-2012 08:29:41 [---] Data directory: D:\Program Files\BONICTEMP

10-Aug-2012 08:29:41 [---] Running under account Administrator

10-Aug-2012 08:29:41 [---] Processor: 2 GenuineIntel Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz [Family 6 Model 15 Stepping 13]

10-Aug-2012 08:29:41 [---] Processor: 2.00 MB cache

10-Aug-2012 08:29:41 [---] Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 nx lm tm2 pbe

10-Aug-2012 08:29:41 [---] OS: Microsoft Windows XP: Professional x86 Edition, Service Pack 3, (05.01.2600.00)

10-Aug-2012 08:29:41 [---] Memory: 2.00 GB physical, 4.85 GB virtual

10-Aug-2012 08:29:41 [---] Disk: 29.30 GB total, 4.53 GB free

10-Aug-2012 08:29:41 [---] Local time is UTC +8 hours

10-Aug-2012 08:29:41 [---] VirtualBox version: 4.1.8

10-Aug-2012 08:29:41 [---] NVIDIA GPU 0: GeForce 9800 GT (driver version 285.58, CUDA version 4.10, compute capability 1.1, 512MB, 466MB available, 546 GFLOPS peak)

10-Aug-2012 08:29:41 [---] OpenCL: NVIDIA GPU 0: GeForce 9800 GT (driver version 285.58, device version OpenCL 1.0 CUDA, 512MB, 466MB available)

You should uninstall Boinc, Move your Boinc Data directory to somewhere outside the Program Files directory, then reinstall Boinc 7.0.28 using the Advanced menu to set the Data directory to it's new location.

Claggy

---

Before the problem happened,the BOINC ran very well.Also I trid to change this（use normally directory）,but this happened too.
HWT

Try to check 'Allow all users to control BOINC' during the installation.

Where is now the 'Data directory'?
(e.g. D:\BOINC_Data should work)

Before the problem happened BOINC ran very well

So what did you do to start "the problem"?
New BOINC install?
BOINC install from different user account in Windows (not the 'Administrator')?
...

---

- ALF - "Find out what you don't do well ..... then don't do it!" :)