The dumps could also be located in>
%systemroot%\minidump\
Absence of a Minidump could also be due to deteriorating motherboard capacitors, or a flakey power supply.
See >>
http://en.wikipedia.org/wiki/Capacitor_plagueYou may also be getting a total crash before Windows has a chance to produce a crash dump. From the 2nd computer you may be able to scan the Hard disk for errors running the command chkdsk /r
....but you need first to backup any valuable data!
Then you could also try the appropriate HD diagnostic from here>
"Hard Drive Diagnostics Tools and Utilities":
http://tacktech.com/display.cfm?ttid=287Normally if you see no minidump you could checkout the settings here>
Enable Minidump's in Windows XP:
http://www.cakewalk.com/Support/ProblemReporter/minidump.asp