Snow Leopard unusable with Broken Pipe messages in the console

Hello
Recently, probably after having installed OS X 10.6.8, I noticed that after a while, something within the OS becomes saturated leading to no new processes being able to be started.  All existing programs continue to run and all seems normal except if a running program needs to call another program (e.g., Mail needing to fetch a password from Keychain Access).
The console then becomes awash with broken pipe messages and a whole bunch of error logs are created for various programs.
This is causing me great irritation as everytime I am forced to restart the machine (sometimes by forcing a hard-reboot).
I would really appreciate any help on this matter.  I would rather not have to completely re-install the OS if I can help it.
The following is a typical excerpt from the system.log:
Oct 29 13:00:11 mbpag activitymonitord[519]: Request failed: Broken pipe
Oct 29 13:00:11 mbpag Activity Monitor[497]: Error communicating with activitymonitord - ipcErr = 1
Oct 29 13:00:11 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40918]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:12 mbpag quicklookd[40918]: [QL] Can't remove user interaction with Security framework: 226
Oct 29 13:00:12 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40918]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:12 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40918]: GetOurLSSessionIDInit(), returned error 0xe2, securitySessionID=0x0 attrs=0 uid=501 euid=501.  cf Radar 5123589.
Oct 29 13:00:12 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40918]: LaunchServices: GetOurLSSessionIDInit() returned err #226, securitySessionID == 0x0, vers=10600000 uid=501 euid=501
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40919]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40919]: GetOurLSSessionIDInit(), returned error 0xe2, securitySessionID=0x0 attrs=0 uid=501 euid=501.  cf Radar 5123589.
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40919]: LaunchServices: GetOurLSSessionIDInit() returned err #226, securitySessionID == 0x0, vers=10600000 uid=501 euid=501
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40920]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40920]: GetOurLSSessionIDInit(), returned error 0xe2, securitySessionID=0x0 attrs=0 uid=501 euid=501.  cf Radar 5123589.
Oct 29 13:00:12 mbpag /System/Library/CoreServices/ReportCrash[40920]: LaunchServices: GetOurLSSessionIDInit() returned err #226, securitySessionID == 0x0, vers=10600000 uid=501 euid=501
Oct 29 13:00:12 mbpag com.apple.launchd.peruser.501[452]: catch_mach_exception_raise_state_identity(): PID: 40920 thread: 0x13d07 type: 0xa code: 0x1000f8044 codeCnt: 0x2 flavor: 0x1000f8054 old_state: 0x1000f805c old_stateCnt: 0x2c new_state: 0x1000f702c new_stateCnt: 0x1000f7028
Oct 29 13:00:12 mbpag com.apple.launchd.peruser.501[452] (com.apple.ReportCrash.Self[40920]): Job appears to have crashed: Abort trap
Oct 29 13:00:12 mbpag com.apple.launchd.peruser.501[452] (com.apple.ReportCrash[40919]): Job appears to have crashed: Abort trap
Oct 29 13:00:13 mbpag com.apple.ReportCrash.Root[40921]: 2011-10-29 13:00:13.015 ReportCrash[40921:2803] Saved crash report for ReportCrash[40919] version ??? (???) to /Library/Logs/DiagnosticReports/ReportCrash_2011-10-29-130012_localhost.crash
Oct 29 13:00:13 mbpag com.apple.launchd.peruser.501[452] (com.apple.quicklook[40918]): Job appears to have crashed: Abort trap
Oct 29 13:00:13 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40924]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:13 mbpag quicklookd[40924]: [QL] Can't remove user interaction with Security framework: 226
Oct 29 13:00:13 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40924]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:13 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40924]: GetOurLSSessionIDInit(), returned error 0xe2, securitySessionID=0x0 attrs=0 uid=501 euid=501.  cf Radar 5123589.
Oct 29 13:00:13 mbpag /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Content s/MacOS/quicklookd[40924]: LaunchServices: GetOurLSSessionIDInit() returned err #226, securitySessionID == 0x0, vers=10600000 uid=501 euid=501
Oct 29 13:00:13 mbpag com.apple.launchd.peruser.501[452] (com.apple.ReportCrash): Throttling respawn: Will start in 9 seconds
Oct 29 13:00:13 mbpag com.apple.ReportCrash.Root[40921]: 2011-10-29 13:00:13.426 ReportCrash[40921:2f03] Saved crash report for quicklookd[40918] version ??? (???) to /Library/Logs/DiagnosticReports/quicklookd_2011-10-29-130013_localhost.crash
Oct 29 13:00:13 mbpag activitymonitord[519]: Request failed: Broken pipe
Oct 29 13:00:13 mbpag Activity Monitor[497]: Error communicating with activitymonitord - ipcErr = 1
Oct 29 13:00:15 mbpag activitymonitord[519]: Request failed: Broken pipe
Oct 29 13:00:15 mbpag Activity Monitor[497]: Error communicating with activitymonitord - ipcErr = 1
Oct 29 13:00:17 mbpag /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/pl ugin-container[40931]: SessionGetInfo(0xffffffff) -> Mach 1102
Oct 29 13:00:17 mbpag /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/pl ugin-container[40931]: GetOurLSSessionIDInit(), returned error 0xe2, securitySessionID=0x0 attrs=0 uid=501 euid=501.  cf Radar 5123589.
Oct 29 13:00:17 mbpag /Applications/Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/pl ugin-container[40931]: LaunchServices: GetOurLSSessionIDInit() returned err #226, securitySessionID == 0x0, vers=10600000 uid=501 euid=501
Oct 29 13:00:17 mbpag activitymonitord[519]: Request failed: Broken pipe

sangak wrote:
I was hoping I'd get a magic solution instead of the dreaded OS reinstall.
That is the magic solution, it gives you a new OS X copy which you immediately update, leaves all your files and programs alone. (unless they have kernel extensions and you need to update those programs)
It's fast, easy and simple, it's Lion "overwrites" that are a pain because it needs the Internet.
There is only one person here that spends his time analyzing such under the hood details and usually has to tell you what I'm saying anyway because that's the only way to correct it.
I'm trying to get you done and out of my way and you back to your life.
I must say that I am quite disappointed with the kernel failing in this way - it is not really in keeping with the robust/Unix reputation...
Don't know what the problem is, it is very robust, but hard drives are based on magnetic bits and those bits fail, the best OS in the world can't stand up if the chair it's standing on is kicked out from underneath it.
OS X only takes 4.5GB, Apple could have incorporates a automatic recovery parttion check upon boot and restored OS X if if didn't boot, but they didn't do that.
Then when they have to place a recovery partiton like in Lion as they are phasing out the optical drive, they make one get online to get a new copy of OS X.
How stupid is that?

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    Clean the Snow Leopard DVD with alcohol and a lint-free cloth from center to rim to be sure there are no finger prints, scratches, or dirt. They try again.

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