Directx 9b

How can i check that Direct x 9 is working properley with my windows and hardware drives, i.e sound.

How can i when i open any web page that it opens in full page instead of me having to keep having to open the page to maximixe view, by clicking the square in the top right corner.

Can anyone recommend a software that will get rid of all the junk files on my hard drive, i.e temp files,files that are left there after i have uninstaled them, and a software that will checked that everything is working ok.