Very infrequent Excel crash

Have 1 user who keeps experiencing an Excel crash when sorting data.

It is very infrequent and as of yet i've not done any serious troubleshooting, just an Office repair.

Event log reports the following:

Log Name:      Application
Source:        Application Error
Date:          07/03/2012 10:57:27
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      luke-p
Description:
Faulting application name: EXCEL.EXE, version: 14.0.6112.5000, time stamp: 0x4e9b2bb3
Faulting module name: mso.dll, version: 14.0.6112.5000, time stamp: 0x4e9b27af
Exception code: 0xc0000005
Fault offset: 0x003e9906
Faulting process id: 0xfe8
Faulting application start time: 0x01ccfc5104d807e5
Faulting application path: C:\Program Files\Microsoft Office\Office14\EXCEL.EXE
Faulting module path: C:\Program Files\Common Files\Microsoft Shared\office14\mso.dll
Report Id: 5370db34-6844-11e1-84fd-2c27d71b430a

Looking around i can't find many solutions, or much information regarding this error.

We have several PC's exactly the same PC's (HP Pro 3305 MT) daily and the problem only occurs on 1 of them.

Dump of Event log errors: http://dl.dropbox.com/u/66653574/Luke%20Excel%20Crash%20Eventlogs.txt

There seems to be multiple issues with working with.xls files (97-2003) in Compatibility Mode. Try having the user save the file as an .xlsx. This eliminated the crashing errors for my users.