If I disable the web shield ie 11 works just fine but when I enable it crashes ie 11. Any way to fix this?
There is a way to get more information as to why an application crashes.
Go to the Control Panel > “Administrative Tools” > double/click “Event Viewer” > Expand “Windows logs” > Click on “Application” then look for the IE crash information in the list by selecting that and you’ll get a lot of details on why the crash occurred. You should see a line in there that gives the “Location:” of the crash which can be helpful in determining what the issue might be with IE.
Here is an MS Windows link on the Event Viewer mentioned above: What information appears in event logs? (Event Viewer)
Log Name: Application
Source: Application Error
Date: 5/20/2015 2:46:46 PM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Jim-PC
Description:
Faulting application name: IEXPLORE.EXE, version: 11.0.9600.17801, time stamp: 0x5536642c
Faulting module name: KERNELBASE.dll, version: 6.1.7601.18798, time stamp: 0x5507b485
Exception code: 0x0eedfade
Fault offset: 0x0000c42d
Faulting process id: 0xb60
Faulting application start time: 0x01d0934666a49649
Faulting application path: C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
Faulting module path: C:\windows\syswow64\KERNELBASE.dll
Report Id: b5d42c96-ff39-11e4-b6c9-00266cdbfc6a
Event Xml:
1000
2
100
0x80000000000000
30269
Application
Jim-PC
IEXPLORE.EXE
11.0.9600.17801
5536642c
KERNELBASE.dll
6.1.7601.18798
5507b485
0eedfade
0000c42d
b60
01d0934666a49649
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
C:\windows\syswow64\KERNELBASE.dll
b5d42c96-ff39-11e4-b6c9-00266cdbfc6a
Microsoft link: How to repair or reinstall Internet Explorer in Windows
The Windows Club: Repair Internet Explorer with Fix IE Utility
Here’s the utility tool on Download.com for you to review: Fix IE Utility
And finally 6 ways How to Repair Internet Explorer
I would take a look at the links in order listed.
Here is a Microsoft Community link regarding your specific problem Internet Explorer 11 Crashes error kernelbase.dll event id 1000 that should be helpful which you might notice touches on the very first links I’ve provided previously, that is specifically the MS Fixit utility.
Another thing you can do is see if there is any corruption in System Files by running the System File Checker.
Click Start
Type: CMD, right click CMD
Click “Run as Administrator”
At the Command Prompt, type: sfc /scannow
This will check for any integrity violations and fix any corrupted operating system files.
Restart your system.
KB Article ID: 929833 - How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7
Looking for more on this in the Microsoft Community I’ve found this Internet Explorer and KERNELBASE.dll and I guess it should be no surprise the thread topic refers to using “SFC SCANNOW” as I just posted above in order to check if any system files have been removed or might be corrupted.
You should be able to address the issue using these resources. Good luck. 
Btw, if none of the above helps then you’d presumably be at the point where you might consider doing a clean install of Avast (there are posts on this topic here in this forum). But considering the problem I wouldn’t think that you should not need to get to that point.
Check back in with your progress, and again good luck.
How do you replace the KERNELBASE.dll file?
Again, have you done an Avast Virus Scan?
OK, if the “Fixit Utility” and/or the "SFC SCANNOW” does not fix it then check out these links to download the missing dll.
You could also try removing and doing a clean install of IE11.
I just will use firefox until microsoft edge comes out. I just hope microsoft edge will work with avast without crashing.