Hey Darkwolfnw,
**** happens!
I'm not sure ISPs could help u on this one since scan is not illegal & that hundreds of thousand are scanned.
Anyway, there almost no solution to IP backtracking except if its performed by a dummy from its own computer (u can try a IP location here ).
For instance there is the decoy mode where a flood of scan probe are generated with different IPsrc but only one is valid. In that case it could be very painful and maybe impossible to know excatly which one is the valid.
If the guy assaulting u send probe with a unique IPsrc, the best you can do is to config ur firewall with a eggress filter on its IP.
I'm just surprise that ur PC connection is crashing, maybe r u facing a DoS attack. I'll advise u to take some trace next time & to publish it within that thread (don't forget to hide your own IP)
hope it help & good luck!
