Checksum or signature error

Last night I downloaded BOINC on a new computer & attached to the project. At the end of it all I received a checksum or signature error and the tasks disappeared. The error message is below. Any suggestions?

Edit - I have just noticed that the tasks are still assigned to me (if that makes any difference!).
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14/01/2010 3:24:00 AM||Starting BOINC client version 6.10.18 for windows_intelx86
14/01/2010 3:24:00 AM||log flags: file_xfer, sched_ops, task
14/01/2010 3:24:01 AM||Libraries: libcurl/7.19.4 OpenSSL/0.9.8l zlib/1.2.3
14/01/2010 3:24:01 AM||Data directory: C:\Users\Drudge\Boinc
14/01/2010 3:24:02 AM||Running under account Miriam
14/01/2010 3:24:03 AM||Processor: 2 AuthenticAMD AMD Turion(tm) 64 X2 Mobile Technology TL-56 [x86 Family 15 Model 72 Stepping 2]
14/01/2010 3:24:03 AM||Processor: 512.00 KB cache
14/01/2010 3:24:06 AM||Processor features: fpu tsc pae nx sse sse2 pni 3dnow mmx
14/01/2010 3:24:09 AM||OS: Microsoft Windows Vista: Home Basic x86 Edition, (06.00.6000.00)
14/01/2010 3:24:10 AM||Memory: 1.87 GB physical, 3.96 GB virtual
14/01/2010 3:24:10 AM||Disk: 64.46 GB total, 11.58 GB free
14/01/2010 3:24:11 AM||Local time is UTC +11 hours
14/01/2010 3:24:11 AM||No usable GPUs found
14/01/2010 3:24:13 AM||Not using a proxy
14/01/2010 3:24:34 AM|Einstein@Home|URL http://einstein.phys.uwm.edu/; Computer ID 2262787; resource share 100
14/01/2010 3:24:34 AM|Einstein@Home|General prefs: from Einstein@Home (last modified 03-Jan-2010 11:15:19)
14/01/2010 3:24:34 AM|Einstein@Home|Computer location: home
14/01/2010 3:24:34 AM|Einstein@Home|General prefs: no separate prefs for home; using your defaults
14/01/2010 3:24:34 AM||Preferences limit memory usage when active to 958.72MB
14/01/2010 3:24:34 AM||Preferences limit memory usage when idle to 1725.69MB
14/01/2010 3:24:34 AM||Preferences limit disk usage to 12.57GB
14/01/2010 3:24:35 AM|Einstein@Home|Started download of einsteinbinary_ABP2_3.02_windows_intelx86.exe
14/01/2010 3:24:35 AM|Einstein@Home|Started download of einsteinbinary_ABP2_3.02_graphics_windows_intelx86.exe
14/01/2010 3:30:52 AM|Einstein@Home|Finished download of einsteinbinary_ABP2_3.02_windows_intelx86.exe
14/01/2010 3:30:52 AM|Einstein@Home|Started download of h1_1097.70_S5R4
14/01/2010 3:33:39 AM|Einstein@Home|Finished download of einsteinbinary_ABP2_3.02_graphics_windows_intelx86.exe
14/01/2010 3:33:40 AM|Einstein@Home|Started download of h1_1047.70_S5R4
14/01/2010 3:33:40 AM|Einstein@Home|Starting p2030_54169_45320_0043_G41.44+01.99.C_5.dm_515_0
14/01/2010 3:33:40 AM|Einstein@Home|Starting task p2030_54169_45320_0043_G41.44+01.99.C_5.dm_515_0 using einsteinbinary_ABP2 version 302
14/01/2010 3:34:41 AM|Einstein@Home|Finished download of h1_1097.70_S5R4
14/01/2010 3:34:41 AM|Einstein@Home|Started download of h1_1040.80_S5R4
14/01/2010 3:34:41 AM|Einstein@Home|Starting h1_1097.35_S5R4__513_S5R6a_1
14/01/2010 3:34:48 AM|Einstein@Home|Starting task h1_1097.35_S5R4__513_S5R6a_1 using einstein_S5R6 version 301
14/01/2010 3:35:26 AM|Einstein@Home|Finished download of h1_1047.70_S5R4
14/01/2010 3:35:27 AM|Einstein@Home|Started download of h1_1041.05_S5R4
14/01/2010 3:35:31 AM|Einstein@Home|Finished download of h1_1040.80_S5R4
14/01/2010 3:35:31 AM|Einstein@Home|Started download of h1_1017.30_S5R4
14/01/2010 3:37:34 AM|Einstein@Home|Finished download of h1_1017.30_S5R4
14/01/2010 3:37:34 AM|Einstein@Home|Started download of l1_1017.30_S5R4
14/01/2010 3:38:07 AM|Einstein@Home|Finished download of h1_1041.05_S5R4
14/01/2010 3:38:07 AM|Einstein@Home|Started download of h1_1160.65_S5R4
14/01/2010 3:39:04 AM|Einstein@Home|Finished download of h1_1160.65_S5R4
14/01/2010 3:39:04 AM|Einstein@Home|Started download of l1_1160.65_S5R4
14/01/2010 3:39:05 AM|Einstein@Home|Finished download of l1_1017.30_S5R4
14/01/2010 3:39:06 AM|Einstein@Home|Started download of h1_1160.90_S5R4
14/01/2010 3:43:08 AM|Einstein@Home|Finished download of l1_1160.65_S5R4
14/01/2010 3:43:08 AM|Einstein@Home|Started download of l1_1160.90_S5R4
14/01/2010 3:43:08 AM|Einstein@Home|[error] File l1_1160.65_S5R4 has wrong size: expected 3847680, got 6847680
14/01/2010 3:43:08 AM|Einstein@Home|[error] Checksum or signature error for l1_1160.65_S5R4
14/01/2010 3:44:16 AM|Einstein@Home|Finished download of h1_1160.90_S5R4
14/01/2010 3:44:16 AM|Einstein@Home|Started download of h1_1055.45_S5R4
14/01/2010 3:44:16 AM|Einstein@Home|[error] File h1_1160.90_S5R4 has wrong size: expected 4262400, got 8262400
14/01/2010 3:44:16 AM|Einstein@Home|[error] Checksum or signature error for h1_1160.90_S5R4
14/01/2010 3:45:13 AM|Einstein@Home|Finished download of h1_1055.45_S5R4
14/01/2010 3:45:13 AM|Einstein@Home|Started download of l1_1055.45_S5R4
14/01/2010 3:45:42 AM|Einstein@Home|Finished download of l1_1055.45_S5R4
14/01/2010 3:45:42 AM|Einstein@Home|Started download of h1_1055.70_S5R4
14/01/2010 3:46:45 AM|Einstein@Home|Finished download of l1_1160.90_S5R4
14/01/2010 3:46:45 AM|Einstein@Home|Started download of h1_1154.15_S5R4
14/01/2010 3:46:45 AM|Einstein@Home|[error] File l1_1160.90_S5R4 has wrong size: expected 3847680, got 6847680
14/01/2010 3:46:45 AM|Einstein@Home|[error] Checksum or signature error for l1_1160.90_S5R4
14/01/2010 3:47:56 AM|Einstein@Home|Finished download of h1_1154.15_S5R4
14/01/2010 3:47:56 AM|Einstein@Home|Started download of l1_1154.15_S5R4
14/01/2010 3:48:54 AM|Einstein@Home|Finished download of l1_1154.15_S5R4
14/01/2010 3:48:54 AM|Einstein@Home|Started download of h1_1154.20_S5R4
14/01/2010 3:49:41 AM|Einstein@Home|Finished download of h1_1055.70_S5R4
14/01/2010 3:49:41 AM|Einstein@Home|Started download of l1_1154.20_S5R4
14/01/2010 3:49:41 AM|Einstein@Home|[error] File h1_1055.70_S5R4 has wrong size: expected 4262400, got 7262400
14/01/2010 3:49:41 AM|Einstein@Home|[error] Checksum or signature error for h1_1055.70_S5R4