Cannot install any softwares!

cannot install any softwares! everytime i try to install anything it asks for my account password,
once i enter it, thats it. nothing happens.
i upgraded it from snow leapord to lion (latest updates). I dont have a DVD to do any kind of disk repair.
please help! i need to install win7 through bootcamp.

just any software.
well the last incident was when i tried to install win7 through bootcamp. at one point it asks me to erase the win7 (as i tried to install win7 like few weeks ago). i checked the option and in the next step it asks me to retore. when i click restore, it asks for my account password. cos thats how my pro is set. everytime i intall it a software or try to make any changes it prompts for my password.
when i enter...... nothing happens. the dialog box (the password prompt box) dissapears. thats it.
no matter how many i try to d it nothing happens.
please!

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