Since yesterday it seems I have some mallware.
I have managed to run the Kaspersky TDSS Killer (advice from forums), found something, rebooted.
I have quickly installed AVG Internet Security (trial period) , Mallwarebytes AntiMalware Pro (trial period) .
Now I have scanned with all of these and again with TDSS Killer , and all of them report nothing.
But I am not able to download anything, all my downloads are deleted for virus reasons directly in the browser (IE9). I think that Microsoft Security Essentials and Microsoft Defender are corrupted, because I cannot start any of them, but I think one of them is blocking my downloads. Also my Windows Action Center reports that "Potentially harmfull software detected, but the "Clean" button does nothing.
All of this is happening with AVG and Malwarebytes active.... and no reaction ... so.... need some help