I am getting the same error reported by mturner on May 27.
6/22/2005 11:39:51 AM|Einstein@Home|Unrecoverable error for result H1_0481.0__0481.4_0.1_T23_Fin1_2 ( - exit code -1073741819 (0xc0000005))
6/22/2005 11:39:51 AM|Einstein@Home|Deferring communication with project for 59 seconds
Error seems to occur about once a day, or so. Always the same error and same exit code. Affected result is not seen again after the error.
Running E@H 4.79, BOINC 4.25, WinXP Home (soon to be Pro), two 3Ghz Intel processors.
Thoughts?
Dean, in addition to trying a new client, you can also try our new test app.

Unrecoverable error ( - exit code -1073741819 (0xc0000005)
)
The error messages in your results appear to be from a different problem. Your machine doesn't seem to have write permission for creating files in the location where BOINC is installed.