Happily working on my computer when a Security Tool Warning appeared. Now I can't get rid of it, tried everything. Checked out your previous posts regarding security tool but can't get anything to open. If I go into help and support for example the window appears for a second then closes down again. If I try system restore and click on restore, the same thing happens. A window appears and then fades out.

I use Windows Security Essentials for my virus checking but it hasn't found anything.
I run Windows 7 upgraded from Vista.
I use a Toshiba Portege A600 notebook.

Any suggestions please - looks like I will be formatting a computer over the holiday rather than looking for Easter bunnies!!