Screen Display Error !!!

Hi guys!
I got a problem with the Option form (For Ex: Option for target,Components Enviroments & Books (picture : picasaweb.google.com/.../August12011 )
These forms lost a right part .I can not drag the form bigger to see the hidden part.I do not know why it is.I re-installed but the result is same.
My PC : Window XP SP3, 2Gb RAM , I installed newest free version Keil uVision4.21 for ARM
Plz help me !!!
Thank for your consideration !!!

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