First, to make sure all traces of Norton are removed you can download and run their removal tool from here: http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
Second, I imagine a lot of space (up to 15% of the drive's total capacity) is being used to store Windows "System Restore Points". The only way to delete these is by 'turning off' System Restore in Control Panel:
1. Control Panel (Classic view) >> System >> System Protection.
2. Untick the box against drive 'C' and click 'Apply'. May take some time to delete if there is a lot of data in the restore points.
3. Now it's up to you if you want to turn SR back on - if so, put tick back in the box against the 'C' drive and click OK. Personally I always have this disabled as often SR doesn't work so it's just wasting space anyway. But I can afford to be without SR because I have a permanent "disk image" of my C drive stored on an external drive. It's your call.
You should hopefully find now that your free space on 'C' drive has increased considerably.
Second, I imagine a lot of space (up to 15% of the drive's total capacity) is being used to store Windows "System Restore Points". The only way to delete these is by 'turning off' System Restore in Control Panel:
1. Control Panel (Classic view) >> System >> System Protection.
2. Untick the box against drive 'C' and click 'Apply'. May take some time to delete if there is a lot of data in the restore points.
3. Now it's up to you if you want to turn SR back on - if so, put tick back in the box against the 'C' drive and click OK. Personally I always have this disabled as often SR doesn't work so it's just wasting space anyway. But I can afford to be without SR because I have a permanent "disk image" of my C drive stored on an external drive. It's your call.
You should hopefully find now that your free space on 'C' drive has increased considerably.