Security Update for Windows 7 (KB2660649) fails installation

System Manufacturer/Model Number: Self
OS: Windows 7 Ultimate Build 7600 32bit
CPU: Intel Pentium 4 550 w/HT @ 3566 MHz
Motherboard: ASRock 775Dual-VSTA
Memory: Kingston K @ 1024MB, Micron 8VDDT6464AG-40B @ 512MB
Graphics Card: nVIDIA GeForce 9500 GT 1GB @ PCI Express 2.0 x16
Sound Card: VIA VT8237A High Definition Audio Controller
Monitor(s) Displays: AOC 2236
Screen Resolution: 1920 x 1080 @32-bit @60 Hz
Keyboard: HP Multimedia Keyboard
Mouse: USB-PS/2 Optical Mouse
PSU: Thermaltake 650 Watt
Case: Custom
Cooling: Custom
Hard Drives: Drive 1 - ST3500418AS @ 465GB, Drive 2 - WDC WD2500JB-00FUA0 @ 232GB, Drive 3 - Maxtor 6L200P0 @ 189GB, Drive 4 - QUANTUM FIREBALLP AS60.0 @ 57GB, Drive 5 - FLASH Drive AU_USB20 @ 3927MB, Drive 6 - USB DISK Pro @ 1908MB
Internet Speed: DL: 11.23MB/s UL:0.90MB/s Provider: SBC Internet Services

Computer Type: Laptop
System Manufacturer/Model Number: Asus K52F or Lenovo B51-80
OS: Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
CPU: i3 370M/i7 6500U
Motherboard: Asus/Lenovo
Memory: 8GB - finally :)/8GB
Graphics Card: it's an i3, dude!/dual Intel&nVidia
Sound Card: onboard
Monitor(s) Displays: 15.6" built-in
Screen Resolution: 1366x768/1920x1080
PSU: n/a
Hard Drives: 750GB Seagate internal Sundry external drives attached to other computers on the local network 1TB SSD on the Lenovo
Internet Speed: as much as I can get - usually on a dongle/phone, so <1MB/s
Browser: IE11/12/Edge/Chrome/FF(if I must)
Antivirus: MSE/Defender