What would cause multiple applications to crash under Vista

I recently installed a new Dell PC running Vista. Word Perfect, Firefox, Photoshop and other applications keep crashing. DEP is set properly. What would or could cause these programs to behave very erratic?
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arnoldConnect With a Mentor Commented:
Get windows debugger with the symbols package/s:

Vista 64 or 32 bit?

You can then start the programs from the debugger.
This should reveal why the applications are crashing or are being shutdown by the OS or other applications you have on the system.
tnesupportConnect With a Mentor Commented:
Review the Reliability Monitor (http://www.howtogeek.com/howto/windows-vista/use-windows-vista-reliability-monitor-to-troubleshoot-crashes/) and the Problems Reporting & Solutions (http://en.wikipedia.org/wiki/Problem_Reports_and_Solutions) applets in the control panel.  These should give you more information.
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