Problem running setup after ransomware corruption

One of our clients lost their DR due to a Ransomware virus. They've cleaned up the server but now when I try to reinstall Progress I get this:

Setup.exe has stopped working. 

Problem signature:
Problem Event Name: APPCRASH
Application Name: setup.exe_InstallShield
Application Version: 12.0.0.58849
Application Timestamp: 45b1a378
Fault Module Name: setup.exe
Fault Module Version: 12.0.0.58849
Fault Module Timestamp: 45b1a378
Exception Code: c0000005
Exception Offset: 0001e7b9
OS Version: 6.1.7601.2.1.0.272.7
Locale ID: 6153
Additional Information 1: cb5a
Additional Information 2: cb5adf8f5bac4bc39db6c83fb76b8021
Additional Information 3: 56cb
Additional Information 4: 56cbcbabf987b27d4985fb8f15b68cbb

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Windows 2008 R2 standard SP1

Progress 10.2B. 

Any ideas before I tell them they need to refresh the server completely?