Java SE (Java Platform, Standard Edition)

We have about 75 computers running Windows XP SP3. On at least 25% of them, when I try to update the Java (they currently have JRE 6U29) to 6U31 I get the following error: "Java(TM) 6 Update 31 -- Error 25025. A previous Java uninstallation was never completed. You need to restart your computer before installing Java."

I am running the update thru a bat file with the following lines:

REM Uninstall 6U29
SET MSIArgs=/qn /norestart REBOOT=ReallySuppress
MsiExec.exe /norestart /x {26A24AE4-039D-4CA4-87B4-2F83216029FF} %MSIArgs%

REM Install 6U31
jre-6u31-windows-i586-s.exe /s /v"/qn ADDLOCAL=jrecore IEXPLORER=1 MOZILLA=1 REBOOT=Suppress JAVAUPDATE=0 AUTOUPDATECHECK=0 JU=0 WEBSTARTICON=0 EULA=0"

Both JQS and JUSCHED are NOT running.

Any suggestions would be appreciated.

Thanks....