ipsbho.dll IE is a 32 bit dll and is shown as an incompatible addon in Windows 8.1 64 bit, IE 11. EPM is checked, but under the Advanced Tab/Security it is not checked. Under Advanced Tab/Security checked is Enable 64 bit processes for Enhanced Protected Mode (EPM). My other 32 bit add-ons appear to be compatible, but the Norton Vulnerbility Protection add-on is not compatible though it appears to get updated. This computer was purchased as Windows 8 and I took the free upgrade to Windows 8.1. I have had very few issues that were undetected, but some where removed by Bleeping Computer site.