Not able to login with user accounts in Windows 7

My sister have gifted me a Acer Timeline Ultra M5-481T laptop on my last birthday it has windows 7 installed in it ,It is really a good choice but from last week whenever i try to login it gave me notification you do not have rights to login this computer I really need help someone plz assist me.

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Hi..

For this you need log in as administrator..

After that you can give permissions to user log in...

Then it will work...

For Giving Permissions..

After Log in as Administrator..

Right click on My computer choose Manage option..

Here click on Local users and Groups..

Now click on Users

Here you can see Administrator and other users..

Now choose through which user you want log in..

Right click on user and Click on Properties...

Click on General tab..

Here you can give permissions to user..

Set permissions.. and click on Apply and OK...

Thank you...

Hello*******
User*******
++++++++++++Try this method for this issue++++++++

****************Go to control panel from start screen of Windows 7 system.

****************Now under the control panel window user account

****************After clicking you will get list of account window.

****************here written make change to your account'

****************now select change your Name options

****************After it display text box

****************According your choice you can provide new name for windows

****************When you enter name then it will ask for password.

****************when you enter password then log in will active.