How to reproduce.

1.) Install 6u10 32 bit JRE from pit b27

2.) open 32 bit command prompt via C:\WINDOWS\SysWOW64

3.) Check java version
C:\WINDOWS\SysWOW64>.\java -version
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b427)
Java HotSpot(TM) Client VM (build 11.0-b11, mixed mode, sharing)

C:\WINDOWS\SysWOW64>ls -al java.exe
-rwxrwxrwa 1 Administrators SYSTEM 139264 Jun 20 23:41 java.exe

4.) Now, install amd64 bit JRE from pit b27

5.) Check java version
 C:\WINDOWS\SysWOW64>.\java -version
'.\java' is not recognized as an internal or external command,
operable program or batch file.

C:\WINDOWS\SysWOW64>ls -al java.exe
ls: File or directory "java.exe" is not found

6.) Check java version on 64 bit command prompt. This is working fine.
C:\WINDOWS\system32>.\java -version
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b427)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b13, mixed mode)

Expected Behavior:
64 bit and 32 bit JRE should not touch each othere system's directory.

Actual Behavior:
64 bit JRE is removing 32 bit java.exe from C:\WINDOWS\SysWOW64 diretory.