my acer laptop seems to be taken over

please may someone help me.im using acer laptop, with windows 7.i can not access much on my pc as it says i have no permissions..there is a new user account on my pc thats given its self admin rights and is stopping me adding my user back to admin i have tried to make another user but seems i have some form of code in place as it says i cant use special letters all ive tried to type is my name nothing else .ive have tried sysytem restoring..restore back to last know working configuration..adding advast and malware.anti,malware.

every time i try to fix or change stuff i get this error.. %windir%\\systems32..

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