Windows 8 Unexpected Kernel mode trap

I was wondering if anyone could help me fix this issue?
My PC crashes a few times a day with this BSOD and I’m losing a lot of working time just rebooting!
http://sdrv.ms/WMU6yR
Thanks
K

though perhaps resolve

https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1454