tetonbob

As part of it's uninstall routine, ComboFix would have reset hidden/system files/folders to default, reset System Restore points, as well as deleted C:\Deckard

We can do that manually.

Reset hidden/system files and folders

• Click Start.
• Open My Computer.
• Select the Tools menu and click Folder Options.
• Select the View tab.
• Deselect the Show hidden files and folders option.
• Select the Hide file extensions for known types option.
• Select the Hide protected operating system files option.
• Click Yes to confirm.
• Click OK.

CLEAR & RESET SYSTEM RESTORE'S CACHE

Go to Start >> Run - type or copy/paste control sysdm.cpl,,4 & press Enter

* Tick on the checkbox - Turn off System Restore on all drives
* Click Apply

Turn it back 'On' by unticking the same checkbox & click Apply, and then OK

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Locate and delete C:\Deckard.

I hope they can help you resolve your Windows Installer issue.