Well port scanning doesnt actually give you access....just tells you ways to get in.

Really depends what sort of computer your talking about, and if it has a firewall.

If its another 'net users computer then its probably not a good idea as there ISP will more than likey see you doing it and if you do anything malicious or they complain to their ISP then you stand a VERY good chance of getting charged.

If its hacking into a computer you have permission to hack into then go ahead, hell companys even pay people to hack into their networks.

One famous story is the Cisco security expert working for a major bank declared their network virtually impenitrable.
The bank hired a hacker to try and get in in and he gained access in less than 15 minutes.

As far as I know Sub Seven dont make hacking software.  They make a freeware port scanner but thats about it.  IF you want "hacking" software then you will have to look a little bit harder than main stream software vendors.