為何一直重複跳出空白視窗的快顯

這兩天電腦每按一個新網頁,就跳出一個空白視窗的快顯,雖然微軟的快顯封鎖程式一直開啟中.
老舊的防毒軟體也已先掃過.先謝過解惑的高人了.

該重複出現的快顯空白視窗的網址為:http://ad.xtendmedia.com/rw?title=&qs=iframe3%3Fg3BuAAJDRgBUU6IAAAAAALFHVQAAAAAAAAAhQAAAAAAAAAsAAQADFb3FawAAAAAAqTIGAAAAAAA9xmwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADqlBgAAAAAAAICAwAAgD8AAGAlnVEO5D8AUFgzCT3qP1ZVSvJltu0%2EAMCWCZVv8z8AAAAAAAAAAACAFXzIs%2Ec%2EAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAVYCqBX3ESDmvD3TK73r2TW7oGmlTSBZare5INAAAAAA%3D%3D%2C%2C%2CB%253D10%2526I%253D1900%2D1007%2526S%253Dbuildathome%2526Z%253D0x0%2526%5Fsalt%253D3421767737%2526e%253D224635%2526r%253D0%2526y%253D28%2Cb5584bac%2Ddd92%2D11e2%2Db9fa%2D101f742e323a%2C1372163295195