Grey screen on start up

Hello David,
We are sorry to know that. To assist you better, could you please send us the screenshot of the AVG window that is grayed out? http://avgclick.me/getscreenshot
Thank you

Installed free AVG OK on Vista laptop. Then clicked on Tune-Up but got message 'there was a problem, try again'. Rebooted computer and now when I turn it on I just get a grey screen instead of the usual homepage with icons. I can bring up Task Master using Cntrl/Alt/Del but none of the options there help. Effectively installing AVG has totally disabled my laptop and it is unusable. Any ideas how to sort this? Thanks.

David, For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions. 
AVG Guru

Hello David,
We are sorry to know that. To assist you better, could you please send us the screenshot of the AVG window that is grayed out? http://avgclick.me/getscreenshot
Thank you