urgent please help me

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http://www.linuxquestions.org – I have installed linux 4 on vmware and my base os is windows xp.After installing linux 4 i am able to copy but not able to paste. In any of the directories and when i type ls -l then there are no write permissions to any of the directories under root and so tried to change it with chmod but chmod is also not working.I am getting the error message changing permissions of '/opt'peration not permitted so i tried to change the umask value also and even the umask value is not getting changed and by default it is 0002..Help me how to resolve this problem on my laptop .Thanks in advance (HowTos)