starts up, loads image or creates new one, but every time I perform an action (IE, firestorm) I get this, or some variation.
running windows 7 64-bit
Problem Event Name: APPCRASH
Application Name: Photoshop.exe
Application Version: 220.127.116.11
Application Timestamp: 58fefd04
Fault Module Name: MMXCore.8bx
Fault Module Version: 18.104.22.168
Fault Module Timestamp: 58ff001f
Exception Code: c0000005
Exception Offset: 0000000000016816
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: ded8
Additional Information 2: ded867b83be724c87a1d985ead2ee57a
Additional Information 3: d3cf
Additional Information 4: d3cf925510fc898745bed528c73c8c35
What have you done for trouble-shooting so far?
Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:
Fingers crossed, did that and updated the video/graphics driver ( windows apparently thinks 4 versions behind is updated) and reset the prefs, so far is working with 0 crashes.