wu's finishing crash wu's still in progress

Hello to all.
Could use some direction. My computer has completed 34 wu's. 11 of them have generated client errors.
The errors coincide with the successfull completion of a wu. The #1 and #26 errors were identical as follows:
4.19
- exit code -1073741674 (0xc0000096)

1
0

***UNHANDLED EXCEPTION****
Reason: Privileged Instruction (0xc0000096) at address 0x77E538A6

1: 02/23/05 20:02:54
1: f:\vs70builds\3077\vc\crtbld\crt\src\malloc.c(212) +0 bytes (_heap_alloc)
1: f:\vs70builds\3077\vc\crtbld\crt\src\malloc.c(113) +0 bytes (_nh_malloc)
1: f:\vs70builds\3077\vc\crtbld\crt\src\malloc.c(54) +15 bytes (malloc)
1: c:\cygwin\cfswin\4_65\lal\packages\std\src\lalmalloc.c(643) +10 bytes (LALMallocLong)
1: c:\cygwin\cfswin\4_65\lal\packages\factories\src\vectorfactories.c(573) +19 bytes (XLALCreateREAL8Vector)
1: c:\cygwin\cfswin\4_65\lal\packages\factories\src\vectorfactories.c(612) +6 bytes (LALDCreateVector)
1: c:\cygwin\cfswin\4_79\lalapps\src\pulsar\fds_isolated\computefstatistic.c(2594) +12 bytes (EstimateFLines)
1: c:\cygwin\cfswin\4_79\lalapps\src\pulsar\fds_isolated\computefstatistic.c(729) +10 bytes (boincmain)
1: SymGetLineFromAddr(): GetLastError = 126

The most common error shows up on result numbers, 3, 12, 14 and 30. This is it:
4.19
- exit code -164 (0xffffff5c)

1
0

Level 0: $Id: ComputeFStatistic.c,v 1.232 2005/02/11 17:03:16 ballen Exp $
Function call `EstimateFLines(stat)' failed.
file ComputeFStatistic.c, line 729

Level 1: $Id: ComputeFStatistic.c,v 1.232 2005/02/11 17:03:16 ballen Exp $
Status code -1: Recursive error
function EstimateFLines, file ComputeFStatistic.c, line 2683

Level 2: $Id: clusters.c,v 1.15 2005/01/03 16:36:02 bema Exp $
Status code 3: Out of memory
function DetectClusters, file clusters.c, line 159
BOINC_ERR_EXIT: now calling boinc_finish()

***UNHANDLED EXCEPTION****
Reason: Access Violation (0xc0000005) at address 0x77F581D3 read attempt to address 0x7FEDF0A4

Does this look like a software memory management problem or a bad stick of ram??? I have 2 - 512mb sticks in this unit. If I remove one what needs to be done to update the BOINC info?? This is my first venture into a project like this.

TIA

Hawkeye