w3wp.exe Faulting Module Server 2012

Hi,
I have a new server 2012 R2 standard install which was working fine - no errors. I installed the pre-reqs for exchange 2013 and then installed exchange 2013. I now have the following errors every few minutes in the event log and I cannot access the exchange admin console due to a Https: 403 error OR the exchange powershell..

Error 1:
Faulting application name: w3wp.exe, version: 8.5.9600.16384, time stamp: 0x5215df96
Faulting module name: webengine4.dll, version: 4.0.30319.34248, time stamp: 0x54d1de81
Exception code: 0xc0000005
Fault offset: 0x00000000000010fb
Faulting process id: 0x4684
Faulting application start time: 0x01d0c52a3eafb820
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\webengine4.dll
Report Id: 7d26ecd7-311d-11e5-80c0-0a94ef004d6f
Faulting package full name:
Faulting package-relative application ID:

Error 2:
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: w3wp.exe
P2: 8.5.9600.16384
P3: 5215df96
P4: webengine4.dll
P5: 4.0.30319.34248
P6: 54d1de81
P7: c0000005
P8: 00000000000010fb
P9:
P10:

Attached files:

These files may be available here:
C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_w3wp.exe_e759088b5726c472c5dfb60cf2a766f55b1641_9e3fd63b_2e59f852

Analysis symbol:
Rechecking for solution: 0
Report Id: 7d26ecd7-311d-11e5-80c0-0a94ef004d6f
Report Status: 4100

Error 3:
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: w3wp.exe
P2: 8.5.9600.16384
P3: 5215df96
P4: webengine4.dll
P5: 4.0.30319.34248
P6: 54d1de81
P7: c0000005
P8: 00000000000010fb
P9:
P10:

Attached files:

These files may be available here:
C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_w3wp.exe_e759088b5726c472c5dfb60cf2a766f55b1641_9e3fd63b_2e59f852

Analysis symbol:
Rechecking for solution: 0
Report Id: 7d26ecd7-311d-11e5-80c0-0a94ef004d6f
Report Status: 0
Hashed bucket:

Has anyone got any ideas?
Jock_ScotlandAsked:
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Jock_ScotlandAuthor Commented:
Installed the .net 4.5 extendability and the ASP .net roles onto the server. errors disappeared and admin console available.

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Windows Server 2012

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