Firefox will not run on Windows 8.1

I have 3 pcs running 8.1 update 1. all run the same AV software ( Emsisoft). All are identical. However one machine will not run FF27-29. Windows tells me that " this app can't run on your PC". I have uninstalled and reinstalled using the stub and also by downloading a complete installer. Neither have helped.
Any thoughts?

These are the specs of the machine which DOES NOT work.
Operating System
Windows 8.1 Pro 64-bit
CPU
Intel Core i5 2500K @ 3.30GHz 53 °C
Sandy Bridge 32nm Technology
RAM
8.00GB Single-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
Gigabyte Technology Co., Ltd. P67X-UD3-B3 (Socket 1155) 39 °C
Graphics
VX2433wm (1920x1080@60Hz)
VX2433wm (1920x1080@60Hz)
1023MB NVIDIA GeForce GTX 550 Ti (Gigabyte) 38 °C
Storage
1397GB SAMSUNG HD154UI ATA Device (SATA) 29 °C
465GB Western Digital WDC WD5000AAKS-00TMA0 ATA Device (SATA) 38 °C
1863GB Western Digital WDC WD20 02FAEX-007BA0 SCSI Disk Device (SATA) 37 °C
931GB Samsung STORY Station 3 USB Device (USB (SATA)) 41 °C
2794GB Western Digital WD My Book 1140 USB Device (USB (SATA)) 37 °C
931GB Western Digital WDC WD1002FAEX-00Z3A0 ATA Device (SATA) 38 °C
931GB Western Digital WDC WD10EARS-22Y5B1 ATA Device (SATA) 37 °C
1863GB Western Digital WDC WD20EADS-32S2B0 ATA Device (SATA) 37 °C
465GB Western Digital WDC WD5000AAKS-00TMA0 ATA Device (SATA) 37 °C
698GB SAMSUNG HD753LJ ATA Device (SATA) 30 °C
1863GB Western Digital WDC WD20 02FAEX-007BA0 SCSI Disk Device (SATA) 37 °C
931GB SAMSUNG HD103UJ SCSI Disk Device (SATA) 37 °C
1863GB Western Digital WDC WD20 02FAEX-007BA0 SCSI Disk Device (SATA) 37 °C
14GB Lexar SD USB_3_0 Read USB Device (USB)
Optical Drives
ASUS DRW-1814BLT ATA Device
Audio
High Definition Audio Device
Her are the specs of a machine which DOES work..
Operating System
Windows 8.1 Pro 64-bit
CPU
Intel Core i7 930 @ 2.80GHz 58 °C
Bloomfield 45nm Technology
RAM
12.0GB Triple-Channel DDR3 @ 532MHz (7-7-7-20)
Motherboard
Gigabyte Technology Co., Ltd. X58A-UD3R (Socket 1366) 44 °C
Graphics
L997 (1600x1200@60Hz)
SyncMaster (1600x1200@60Hz)
2047MB NVIDIA GeForce GTX 660 (Gigabyte) 40 °C
Storage
119GB ADATA SX900 (SSD) 33 °C
29GB A-DATA SSD (SSD)
279GB Western Digital WDC WD3000HLFS-01G6U1 (SATA) 36 °C
1863GB Western Digital WDC WD2002FAEX-007BA0 (SATA) 40 °C
931GB Samsung STORY Station 3 USB Device (USB (SATA)) 43 °C
1397GB Western Digital WD 15EADS External USB Device (USB (SATA)) 41 °C
Optical Drives
HL-DT-ST DVDRAM GH22NS50
Audio
High Definition Audio Device
I hope this helps!
many thanks

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