Hey what are some good spyware detectors/removers?

I need something free that you can download and/or use without having to use the administrator rights or power or whatever you call it. I have a school issued laptop and it has NO spyware/malware protection and I am greatly worried. Just give me detectors if you have to, i can manually remove it if i have to/can. PLEASE remember that you can only tell me ones that DONT require administrator rights to install and use. Also please include the download link.