After I set the scope to structure only I got some relief. But after a short while it returned. I uninstalled an reinstalled 7.5 and 7.5.4 I did not go to 7.5.5 which is where I was having the trouble. I have been running all morning with no crashes as of yet. Fingers crossed, I hope it lasts.
While opening a series of files the system just closes. With the message "NX Component has stopped working" I also get
*** EXCEPTION: Severe error 904 in line 161 of O:\ugnx755\ip4\src\syss\sm\ind\sm_init.c at Thu Jun 07 08:29:06 2012 Eastern Daylight Time
+++ Attempt to free already free...