DEP (Data Execution Prevention) on Windows 2003 SP1 and XP SP2 has led to a problem with installing BPE3.1 on Win2003 SP1.
To get this it working add the BP3.1 executables to the DEP exception? (DEP options in "Properties/Advanced/Performance/Data Execution Prevention" on My Computer.)
Install failed on:
Windows 32-bit version
Pentium 4 Processor