UE4 will not login to authenticate and program crashing

I had to reinstall program due to bad sectors of HDD, effected 2 other programs, but they reinstalled fine.
Program starts then immediately crashes, internet is fine and all other programs that need internet access working.
It has been working fine for 4 months until this problem occurred.

OS Name Microsoft Windows 7 Professional
Version 6.1.7601 Service Pack 1 Build 7601
System Manufacturer ASUS
System Model All Series
System Type x64-based PC
Processor Intel(R) Core™ i5-4670 CPU @ 3.40GHz, 3401 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 1802, 1/28/2014
Installed Physical Memory (RAM) 24.0 GB
Name NVIDIA GeForce GTX 660 X2 in SLI

Windows problem details:
Problem signature:
Problem Event Name: APPCRASH
Application Name: UnrealEngineLauncher.exe
Application Version:
Application Timestamp: 54069a1d
Fault Module Name: StackHash_48f1
Fault Module Version: 6.1.7601.18247
Fault Module Timestamp: 521eaf24
Exception Code: c0000374
Exception Offset: 00000000000c4102
OS Version: 6.1.7601.
Locale ID: 1033
Additional Information 1: 48f1
Additional Information 2: 48f1d60866f5bf660001721589709748
Additional Information 3: d5f9
Additional Information 4: d5f99a0ce239b524614fd552c58cbf84

Dump file of last attempt Sept 10

Log File from last attempt

HI ajbombadil,

Could you try the Troubleshooting steps for the Fails to Load/Crash section in the link below?

If nothing works for you, follow the steps at the bottom on the page and post your Verbose Logs. They will help us track down the issue.

It would be appreciated if someone would respond, I am now getting behind on my project…

Hello and thank you for your reply.

I have tried all suggestions in link and still crashing at startup and not authenticating. I have attached my last logfile.link text

The windows error report:
link text

Thank you for the DMP and error files. We also need your Verbose Logs. The link in my previous post has directions on how to find them.

Hello, sorry about that here it is.link text

Hi ajbombadill,

I think maybe your content cache has gotten corrupt. The crash occurs when trying to display an image file that is loaded from the drive.

Could you try rename the image content cache folder in order to test this theory?

You’ll find it here:-<\br>

If that works fine you are safe to the delete the renamed folder.

Let me know if that helps!

Hello, thank you that seems to have corrected the crashing on loading. I am now just having troubles loading some of the levels in my project, but will try them all then let you know if it is a level based crash or the entire project.

Hello, thank you, that seems to have corrected the crashing on loading.

I am now just having troubles loading one of the levels in my project, I have attached the callstack report for the crash.

link text

Hello again, I have corrected the problem, the one level map was damaged, I replaced it with a backup copy and the level is working fine now.

Thanks for all your help Leigh, as well as the initial help from TJ, it is greatly appreciated, now back to my project!