Game screen crashes every few seconds

My friend cannot play the game properly because her screen goes blank every few seconds. It's very frustrating. On occasion she starts to red ball but then recovers. We tried setting ffxiv to high priority (this was my issue) but it worked for only a few minutes, then back to crashing. This issue keeps getting put in resolved, but the solution that a few people suggested has not worked for her, thus for her, is not resolved. Her graphics card is GTX 670 series so I don't think it is a hardware issue. This never happened before patch 2.1. Suggestions or a way SE can resolute?

System Summary

OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer Gateway
System Model FX6800-03h
System Type x64-based PC
Processor Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2666 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date AMI R01-A1, 10/29/2008
SMBIOS Version 2.5
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
Installed Physical Memory (RAM) 19.0 GB
Total Physical Memory 16.0 GB
Available Physical Memory 13.5 GB
Total Virtual Memory 32.0 GB
Available Virtual Memory 29.3 GB
Page File Space 16.0 GB
Page File C:\pagefile.sys

Name NVIDIA GeForce GTX 670
PNP Device ID PCI\VEN_10DE&DEV_1189&SUBSYS_26783842&REV_A1\4&1635B5A2&0&0018
Adapter Type GeForce GTX 670, NVIDIA compatible
Adapter Description NVIDIA GeForce GTX 670
Adapter RAM (2,147,483,648) bytes
Installed Drivers nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver Version 9.18.13.3523
INF File oem16.inf (Section093 section)
Color Planes Not Available
Color Table Entries 4294967296
Resolution 1768 x 992 x 60 hertz
Bits/Pixel 32
Memory Address 0xFA000000-0xFAFFFFFF
Memory Address 0xD8000000-0xDFFFFFFF
Memory Address 0xD6000000-0xD7FFFFFF
I/O Port 0x0000DC00-0x0000DC7F
IRQ Channel IRQ 24
I/O Port 0x000003B0-0x000003BB
I/O Port 0x000003C0-0x000003DF
Memory Address 0xA0000-0xBFFFF
Driver c:\windows\system32\drivers\nvlddmkm.sys (9.18.13.3523, 12.12 MB (12,708,128 bytes), 3/22/2014 7:15 PM)