Permission Denied when trying to delete /var
I've recently put a hard drive from an old linux system into my new one. There is some important data on the drive which I need to keep - but I need to delete the bin, usr, var etc etc directories. Some of those delete ok - but when I try to delete some of them (with rm -rf) I get a permission denied error. I've tried doing chmod -R 777 on the directory - but still get the error. Is there any way to 'force delete regardless of anything' these directories?