Hi Boggin:
Here are detauls from Event Log
Log Name:      System
Source:        Microsoft-Windows-WindowsUpdateClient
Date:          11/15/2014 5:16:31 PM
Event ID:      20
Task Category: Windows Update Agent
Level:         Error
Keywords:      Failure,Installation
User:          SYSTEM
Description:
Installation Failure: Windows failed to install the following update with error 0x80070002: Security Update for Microsoft .NET Framework 4.5, 4.5.1 and 4.5.2 on Windows 7, Vista, Server 2008, Server 2008 R2 x64 (KB2978128).
Event Xml:
<Event xmlns="
http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-WindowsUpdateClient" Guid="{945A8954-C147-4ACD-923F-40C45405A658}" />
    <EventID>20</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>1</Task>
    <Opcode>13</Opcode>
    <Keywords>0x8000000000000028</Keywords>
    <TimeCreated SystemTime="2014-11-15T16:16:31.961006500Z" />
    <EventRecordID>1686480</EventRecordID>
    <Correlation />
    <Execution ProcessID="900" ThreadID="3452" />
    <Channel>System</Channel>
    </System>
  <EventData>
    <Data Name="errorCode">0x80070002</Data>
    <Data Name="updateTitle">Security Update for Microsoft .NET Framework 4.5, 4.5.1 and 4.5.2 on Windows 7, Vista, Server 2008, Server 2008 R2 x64 (KB2978128)</Data>
    <Data Name="updateGuid">{E257D135-40B9-4361-9E7D-8537D256D54B}</Data>
    <Data Name="updateRevisionNumber">202</Data>
  </EventData>
</Event>
Moreover I tried your suggestio:
1.NET Framework Repair Tool - webpage unavailable
2 NET Framewwork Installation - crashed
Thank you for now
Marek