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#11
The Bad Pool Header involving the ntoskrnl.exe file is usually from an error on the OS drive. When installing the 7 RC on a drive removed from an external casing(WD Essentials Green Power 500gb) I ran into every problem with anything being run due to what? The drive itself! The energy savers do not make good OS drives to begin with!
Other then that being the first 7 install on an old P4 board I wouldn't see any other thing in particular why the 32bit 7 wouldn't run. You may still want a good run of memtest just the same to rule out any bad ram with the DDR400 memory you have in the old case there. Bad Ram or simply seeing a bad incomplete Windows install is often the case with older hardwares while the old Socket A case I tossed 7 onto fast ran like a charm!
The web page going white and anything similar with a Windows Explorer window would suggest it was time for a clean install if you are running into that type of problem too frequently. Other then that occasionly you may have a fluke of something trying to load sideways into memory.