Hi My system is giving prob PLZZZZZZZZ help?

My sys 's properties and some othe functions are not working properly in short they are not opening.If I openn then this msg appears 'The operation has been cancelled due to restrictions in effect on this computer.Please contact your system administrator" Please tell ME WHY THIs is happening.I recently dwnloaded a virus scan on my comp but it turned out to be a virusSo i went in safe made n deleted the virus scan Since then it is giving problem CAN U GUYS PLZ HELP ME OUT