When The PC Support Group recently received a call about a non-booting computer we were able to trace it to an attempted installation of XP service pack 3. The user has a Dell Dimension 9200 with XP service pack 2. Service pack 3 had installed perfectly but upon rebooting to complete the installation they were greeted with the well-known blue-screen-of-death (or BSOD) with stop code 0x0000007E stating "there was an attempt to Execute non-executable memory". This also happened in safe mode. It did not happen in any live CDs so the approach we took was to uninstall the service pack.
So step 1. take an image backup using Acronis True Image to make sure that if the worst happens you still have a copy of all the data.
step 2. boot the computer using the original install CD and select the recovery console
step 3. Use the recovery console approach here to uninstall the service pack
Alternative step 2.
If you do not have the original install CD then you may be able to use an alternative install CD, but in this case the computer has a RAID setup that is not supported by the standard XP install CD. In this case the best option available for us was to boot from an Ultimate Boot CD for Windows (UBCD4Win). In order to use the RAID drivers you need to add the Mass Storage drivers from the Driver-pack plugin (this would be at step 7 in their how to http://www.ubcd4win.com/howto.htm).
This did work for us, but something worth noting is that Dell drivers are available from their public FTP site ftp.us.dell.com
Alternative step 3.
Once into the UBCD4Win environment then launch a command shell and type:
cd c:\Windows\$ntservicepackuninstall$\spuninst
ren spuninst.txt spuninst.bat
spuninst.bat
You should now be able to boot into Windows.
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