Internet Explorer Crashes

My CEO's IE installation keeps crashing randomly. He has Windows 7 Ultimate 64bit installed, and is running the 32bit version of IE8.

Here are the details from the windows event log:
Log Name:      Application
Source:        Application Hang
Date:          4/21/2010 1:56:51 PM
Event ID:      1002
Task Category: (101)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      COMPUTER7.DOMAIN.com
Description:
The program iexplore.exe version 8.0.7600.16385 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
 Process ID: 1608
 Start Time: 01cae17c25f72d51
 Termination Time: 14
 Application Path: C:\Program Files (x86)\Internet Explorer\iexplore.exe
 Report Id: a12a1482-4d77-11df-bd49-002219e139cc

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Hang" />
    <EventID Qualifiers="0">1002</EventID>
    <Level>2</Level>
    <Task>101</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-04-21T18:56:51.000000000Z" />
    <EventRecordID>9195</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Pritchett7.petris.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>iexplore.exe</Data>
    <Data>8.0.7600.16385</Data>
    <Data>1608</Data>
    <Data>01cae17c25f72d51</Data>
    <Data>14</Data>
    <Data>C:\Program Files (x86)\Internet Explorer\iexplore.exe</Data>
    <Data>a12a1482-4d77-11df-bd49-002219e139cc</Data>
    <Binary>430072006F00730073002D00700072006F00630065007300730000000000</Binary>
  </EventData>
</Event>

any ideas?

Thanks.