Drop-down Menus and Boxes Will Not Stay Open in MS Office 2010 - Microsoft Community

i made video show issue: https://www.dropbox.com/s/ouo7bebwljilhfz/screencaptureproject34.mp4?dl=0

i noticed issue on forum in several locations windows whole had simple resolution hasn't matched mine (and mine in office, not windows).  when open drop-down window (menu or box, i've seen called 3 don't know correct), won't stay open long enough me use it.  the time open varies super short relatively short.  i'm showing in excel, happening across ms office software.  itunes, example, not produce issue.

office 2010

windows 7 64bit

15gb ram

intel core i7 cpu 3.07ghz

it not mouse.  i've tried 3.

it not stuck key on keyboard.  i've tried 2.

it not virus or malware.  i have contacted eset, antivirus provider had me perform deep cleans , combed through 2 reports (twice after bugged them again).  (i use malwarebytes , ccleaner regularly, since i've been paid subscriber eset long time, used service.)

i have more enough ram , processing space.  i've watched running processes , no spike seems occur, either. 

my windows up-to-date, although there windows defender update has refused install, has been lot longer issue has been happening , i've taken sort of conflict i've yet sort out other anti-virus(es/i).

i'm defragged.

and yes, computer plugged in. :d 

it driving me insane (you bananas grabbed list of fruit video demo!).  i @ point i'd take shop, there isn't local , use computer self-employment.

hello,

for identify causing issue, need confirm information. please answer following:

• when did first encounter issue?
• have tried troubleshooting steps prior contacting us?
• were 1 created drop-down menus in office application?
• what last activity when issue happened?
• any changes took place in computer before issue occurred?

Office / Unknown/other / Windows other / Office 2010