Back up error -19, can't backup iPhone 3gs or upgrade to OS4.

When my iPhone is connected and begins to sync it pops up saying "MobileBackup has stopped working." iTunes then displays a window saying "iTunes could not back up the iPhone because the back up session failed."
When attempting to upgrade to OS4 it extracts the software, then has the same error again when trying to back up. It's a back up error -19.
When right clicking on the iPhone name on the left panel, it displays "MobileDeviceHelper has stopped working".
I have tried uninstalling & reinstalling everything with no success, and have the latest version of iTunes. I discovered though that by ignoring the errors I am still able to transfer data onto the iPhone and also applications from the phone into iTunes.
Please help?

Hi,
I am facing the same problem. I had done a clean uninstalled and reinstalled iTune, hwoever it does not solve my problem. The error message of the ApplieMobileBackup keeps appear:
<EXE NAME="AppleMobileBackup.exe" FILTER="GRABMIFILTERPRIVACY">
<MATCHING_FILE NAME="AppleMobileBackup.exe" SIZE="33056" CHECKSUM="0x4F2874C9" BINFILEVERSION="17.751.6.23" BINPRODUCTVERSION="3.2.0.0" PRODUCT_VERSION="3.2.0.0" FILE_DESCRIPTION="MobileBackup" COMPANY_NAME="Apple Inc." FILE_VERSION="17.751.6.23" ORIGINAL_FILENAME="AppleMobileBackup.exe" LEGAL_COPYRIGHT="© 2010 Apple Inc. All rights reserved." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x0" VERFILETYPE="0x0" MODULE_TYPE="WIN32" PE_CHECKSUM="0x13A75" LINKER_VERSION="0x0" UPTOBIN_FILEVERSION="17.751.6.23" UPTOBIN_PRODUCTVERSION="3.2.0.0" LINK_DATE="08/06/2010 15:35:06" UPTOLINKDATE="08/06/2010 15:35:06" VER_LANGUAGE="English (United States) [0x409]" />
<MATCHING_FILE NAME="AppleMobileBackup_main.dll" SIZE="148768" CHECKSUM="0x269B81FB" BINFILEVERSION="17.751.6.23" BINPRODUCTVERSION="3.2.0.0" PRODUCT_VERSION="3.2.0.0" FILEDESCRIPTION="MobileBackupMain" COMPANY_NAME="Apple Inc." FILE_VERSION="17.751.6.23" ORIGINALFILENAME="AppleMobileBackupmain.dll" LEGAL_COPYRIGHT="© 2010 Apple Inc. All rights reserved." VERFILEDATEHI="0x0" VERFILEDATELO="0x0" VERFILEOS="0x0" VERFILETYPE="0x0" MODULE_TYPE="WIN32" PE_CHECKSUM="0x30518" LINKER_VERSION="0x0" UPTOBIN_FILEVERSION="17.751.6.23" UPTOBIN_PRODUCTVERSION="3.2.0.0" LINK_DATE="08/06/2010 18:50:01" UPTOLINKDATE="08/06/2010 18:50:01" VER_LANGUAGE="English (United States) [0x409]" />
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