How to permanently remove annoying message?

Every time I start the computer anew one of the "things" that eventually

appear on the monitor screen is a small window with a message.

It reads something like the computer needs my approval to install a new

driver, or new software to operate new hardware, or some such rot.

(I'm not trying to install new hardware or anything else)

Sorry I can't give you the exact message but the problem is it takes

repeated clicking on the little red-x in the upper right hand corner to finally

get rid of this message once and for all.

Until I start the computer again the next day!

The question comes in three parts.

The first part asks me to give permission for installation.

The second part says "ask me later"

The third part says "don't ask me any more."

Months ago, the very first time I saw this message I thought it came

from Avast!, my anti-virus program, so I clicked OK for installation.

But it could not install.

Then I tried clicking "don't show this message again"

But every-time I start the computer anew it reappears.

I'm a software idiot so if you think you know how I can delete this message

so it NEVER reappears when I start the computer anew please tell me

in simple terminology.

I WILL FOREVER BE GRATEFUL TO YOU!