Lately I will be in the middle of viewing a web page and a pop up graphic will appear smack dab in the middle of the screen. There is no way to close it because if you click on it it takes you to its web page. The way I normally get rid of them is to reload the page.They are not always the same advert. They are also not the usual type of pop up we are all used to (the ones you click on and close).
I am using the following programme's:
Web Washer
Adsubtract
Adaware
McaFee virus scanner
Windows xp
latest internet explorer
Any suggestions? Please explain as if I am four.