Recently installed Skype for Business (Lync 2013) on a Windows 7 laptop.  Installation appears to have completed successfully.  Instant messaging works fine.  Having issues with connecting into Skype meetings (both originated by myself and those originating from someone else in my organization).  Once the connection is initiated the application hangs and ultimately crashes.  Event viewer shows the following items

Log Name:      Application
Source:        SideBySide
Date:          7/21/2015 7:33:17 AM
Event ID:      35
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:     
Description:
Activation context generation failed for "C:\Program Files\Microsoft Office 15\root\office15\lync.exe.Manifest".Error in manifest or policy file "C:\Program Files\Microsoft Office 15\root\office15\UccApi.DLL" on line 1. Component identity found in manifest does not match the identity of the component requested. Reference is UccApi,processorArchitecture="AMD64",type="win32",version="15.0.0.0". Definition is UccApi,processorArchitecture="x86",type="win32",version="15.0.0.0". Please use sxstrace.exe for detailed diagnosis.
Event Xml:
<Event xmlns
  <System>
    <Provider Name="SideBySide" />
    <EventID Qualifiers="49409">35</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-07-21T12:33:17.000000000Z" />
    <EventRecordID>10346</EventRecordID>
    <Channel>Application</Channel>
    <Computer>SYSINCNBU003.sysmexd.sysmex.de</Computer>
    <Security />
  </System>
  <EventData>
    <Data>UccApi,processorArchitecture="AMD64",type="win32",version="15.0.0.0"</Data>
    <Data>UccApi,processorArchitecture="x86",type="win32",version="15.0.0.0"</Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>C:\Program Files\Microsoft Office 15\root\office15\lync.exe.Manifest</Data>
    <Data>C:\Program Files\Microsoft Office 15\root\office15\UccApi.DLL</Data>
    <Data>1</Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
    <Data>
    </Data>
  </EventData>
</Event>

• Moved by George.Zhao CHNMicrosoft contingent staff 2 hours 24 minutes ago

Hi,

Since this issue is related to Lync, I'll move your thread to lync forum:

https://social.technet.microsoft.com/Forums/office/en-US/home?category=lync

The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.

George Zhao
TechNet Community Support