One of my starting points for this type of error is to check all shell extensions. ShellExView can be useful to see which shell extensions have been introduced into Explorer by third party applications.
Read about it then scroll down to the bottom to download the x86 (32-bit) or x64 (64-bit) version here http://www.nirsoft.net/utils/shexview.html
Click on the Company column to alphabetically sequence the entries. Assuming that the Microsoft entries are bona fide, is there anything else listed that is either unnecessary or suspicious? If so, highlight it and click the red button to disable it. If you accidentally disable an item, it is reversible by clicking the green button.
