Does anyone know how to fix it?
Have you tried running it as administrator, also some other background program could be the cause sometimes make sure you close any program you suspect might interfere with installation.
Please provide us some details on your computer system. The easiest way is to provide us with a DxDialog report.
To create it click start and type dxdiag then press enter, then click the Save All Information button, and then open up that file select all of the text and paste it into the text box on pastebin.com, then give it a name and click Create New Paste, then paste the URL of the page that loads next to your post here. This will let us see what hardware and software you have installed, and will help us figure out why this is occurring.
Thanks