Hopefully you already running a firewall. Go to Shieldsup (grc.com) and check that your ports show as fully stealthed - this makes your 'puter look like it is off or doesnt exist, and forces the scanner to spend the maximum amount of time on your ip before moving to the next ip.
There are pages to report scanners (I forget which ones - try typing hacker report in browser search bar), also ZoneAlarmPro (free trial) will show where the offending address is physically located (they say) and SamSpade and other sites will help you locate the abuse authority for this ip's isp so you can lodge a complaint with them. (Chances are, this computer belongs to some poor schlub who doesnt keep up with windows patches and got it taken over by a trojan, but, you never know, and in any case, some Isp's will shut down the offending addy until they get their problem solved).
Again, everyone should not use Internet explorer browser without using High security settings, we don't know which web sites are still infected.
