Acrobat Reader DC crashes when attempting to search the document

Acrobat Support, please can you help me solve this problem?

I have version 15.020.20042 running on Windows 7, 64 bit.

*Every time* I search a document it crashes with this log:

Problem signature:
  Problem Event Name: BEX
  Application Name: AcroRd32.exe
  Application Version: 15.20.20042.8920
  Application Timestamp: 5811d4c2
  Fault Module Name: StackHash_0a9e
  Fault Module Version: 0.0.0.0
  Fault Module Timestamp: 00000000
  Exception Offset: 00000000
  Exception Code: c0000005
  Exception Data: 00000008
  OS Version: 6.1.7601.2.1.0.256.48
  Locale ID: 2057
  Additional Information 1: 0a9e
  Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
  Additional Information 3: 0a9e
  Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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If the online privacy statement is not available, please read our privacy statement offline:
  C:\Windows\system32\en-US\erofflps.txt

I have attempted to repair it via the control panel: no change. I have even attempted to uninstall it and I get:

"The system administrator has set policies to prevent this installation." I am logged on as an administrator.

Thank you for your help,

Chris