Dialogue box freezez when try opening a file

I'm having difficulty on uploading and even opening any file such as images, documents and etc.
Whenever i use adobe photoshop/imageready, i click File->Open then dialogue box appears.
I choose an image then ofcourse i click Open, then the program freezez. I mean, i have to
end the process then open it again then the same problem happens.

Even on the browser(firefox, IE, safari), i can't upload any image on friendster, imageshack,
and even html files on ripway and stormpages. The dialogue box also freezez when I click
Open upon browsing it. When i click the View as Thumbnail, it also freezez when i try to
scroll down and locate any picture.

HELP! :[