It does not really matter that Windows cannot see your anti virus,as long as you have one and it is up to date. If you are getting annoying messages from Windows 7 security center,turn them off here.click here
If you are using W7 then you should be using Microsoft Security Essentials (MSE) click here along with the W7 firewall. They all integrate perfectly and are as good as anything else on offer - and often better.
Ta DMS and I do use and like MSE on a laptop but Virgin, if you are on a higher package, do provide the full monty and therefore why not use it? However, out of interest I might uninstall the Virgin pack and install MSE and see if Win 7 sees that. Wot U fink?
To add to all this I am getting a little peeved with Win 7. I am also getting occasional very slow shutdowms (about 4 mins) and occasionaly the mouse semi-freezes. There is nothing consistent about theses problems. My PC is only about 2 months old and I reinstalled Win 7 to try and rid of the probs but they keep cropping up.
Oops ignore last. I dont suppose you have any more security programs downloaded.Are you just using the Virgin package without any other back up. maybe try the free Version of malwarebytes update and run that to see if it finds any problems.