I keep getting this flashing sign in the bottom L/H corner near the start button. it looks like some kind of shield and when I click on it it says
User Account Control
Google update is requesting your permission
Do you want the following program to make changes to your computer
The shield is normal with Win7 and nothing to be concerened about. It just asks for your permission making changes which is a security feature for your protection. I would imagine you are new to Win7 if you have not encountered it before.
It occurs frequently with updates and installing new software, as long as you know what it is installing then chose the yes option. If you are unsure then deny permission and ask here, you will still have the option to instal later when you are happy to do so.