a bit of advice about hamachi:
DON'T install it on a laptop.
it may work on some, but my guess is, due to the differences in the archetecture between a PC and a laptop, hamachi is not necessarily gonna work on one.
(it caused my laptop to have a 1/2 hour boot up - most of which involved sitting on a screen of my desktop, but due to memory being eaten up, nothing could be opened through clicking on it).
anywho, uninstalling it fixed the prob for me.
on a side note, my PC has had no complaints with it so far, so i may attempt to play op2 online through it.