If you receive error 80073712 when you try to install Windows updates, you should apply the 80073712 fix.
Vista 80073712 Error Fix
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STEP 1: Download UnHackMe for freeUnHackMe removes Adware/Spyware/Unwanted Programs/Browser Hijackers/Search Redirectors from your PC easily.
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System Requirements: Windows 2000-Windows 8.1/10 32 or 64-bit. UnHackMe uses minimum of computer resources.
STEP 2: Double click on UnHackMe_setup.exeYou will see a confirmation screen with verified publisher: Greatis Software.
Once UnHackMe has installed the first Scan will start automatically
STEP 3: Carefully review the detected threats!Click Remove button or False Positive.