Service Template Update

When you update a service template what is the differance between "Apply Template" and "Commit Template"?

I have tried both and when I Apply a template it restarts the VM and Commit does not, and on occasion after commiting a template the ScvmmGuestService.exe stops running and I get this error.

Log Name:      Application
Source:        Application Error
Date:          4/24/2013 6:14:26 PM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ELIBAPPAUS
Description:
Faulting application name: ScvmmGuestService.exe, version: 3.1.6011.0, time stamp: 0x50aaf399
Faulting module name: KERNELBASE.dll, version: 6.2.9200.16451, time stamp: 0x50988aa6
Exception code: 0xe0434352
Fault offset: 0x000000000003811c
Faulting process id: 0x138
Faulting application start time: 0x01ce415235483e3e
Faulting application path: C:\Program Files\Microsoft System Center Virtual Machine Manager 2012 Guest Agent\bin\ScvmmGuestService.exe
Faulting module path: C:\Windows\system32\KERNELBASE.dll
Report Id: 785944c7-ad45-11e2-9404-00155d036804
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-04-25T01:14:26.000000000Z" />
    <EventRecordID>65173</EventRecordID>
    <Channel>Application</Channel>
    <Computer>ELIBAPPAUS</Computer>
    <Security />
  </System>
  <EventData>
    <Data>ScvmmGuestService.exe</Data>
    <Data>3.1.6011.0</Data>
    <Data>50aaf399</Data>
    <Data>KERNELBASE.dll</Data>
    <Data>6.2.9200.16451</Data>
    <Data>50988aa6</Data>
    <Data>e0434352</Data>
    <Data>000000000003811c</Data>
    <Data>138</Data>
    <Data>01ce415235483e3e</Data>
    <Data>C:\Program Files\Microsoft System Center Virtual Machine Manager 2012 Guest Agent\bin\ScvmmGuestService.exe</Data>
    <Data>C:\Windows\system32\KERNELBASE.dll</Data>
    <Data>785944c7-ad45-11e2-9404-00155d036804</Data>
    <Data>
    </Data>
    <Data>
    </Data>
  </EventData>
</Event>