cant open rar files

I have an administrator thats preventing me from opening winrar to do rar files i dont need winrar installed i just wanna run it to make a magic memory stick quick and i will never use it again is there any way that i can get a magic memory stick without needing to install something, like just by opening the file. Or is there a way that i can override my administator. please contact at pimpin_donwon@yahoo.com subject: magic memory stick

Thanks a lot i would really appreciate the help