Problem with HP Pavilion ze5170. XP SP2.
User loaded Firefox and was then prompted to download and install Flash plugin.
User did so and rebooted machine when prompted.
Machine failed on bootup with blue screen and error message: IRQL_NOT_LESS_ OR_EQUAL etc
User implemented system restore but problem remains.
I manually deleted Mozilla and Flash (programme directories, registry entries and temporary folders)
I deleted virtual memory file and recreated it (did not defrag in between).
Any ideas very gratefully received.