McAfee

McAfee's main window only displays a white box

See Document ID: TS101233 on McAfee's Web site.
Solution number one will probably work.

mfeaack.sys blue-screen error

If you're receiving a blue-screen error window referencing mfeaack.sys, this is a McAfee-related problem. You will need to uninstall and re-install McAfee. If you use the program AutoRuns and search for mfeaack.sys you'll see it's a McAfee file.