When you click on e.g. a .txt document, it take minutes to open notepad and then display the document. If, however, Notepad is opened first and the document dropped on to Notepad, it all works really quickly.
Also, if you double click a .jpg image, it takes minutes to open MS Paint and then display the image. If, however, the application is opened first and the image dropped on to the application, it all works really quickly.
When a document is right-clicked, the menu takes minutes to appear.
Strangely, when the network card is disabled everything happens really quickly.
I have now 3 pc acting like this.
I shure that is not a hardware problem like broken network card.