AVG Internet Security doesn't seem to be installing properly

i had to have my PC repaired and now am reinstalling software

when i try to install AVG from my online account the file downloads and when i open it it begins the process.

But then nothing seems to happen

My windows task manager says it is running but there's no sign of any mempory usage - it just appears ot be hanging there - if it means anything, the column 'Memory (private workign set)' shows a constant of 22176k - 'CPU' is '00'

i'm sure from previous experience it's very quick to get up and running so does anyoen know what the problem is?

am using W8.1 64-bit

any advice?