Computer Wont Connect

I have a windows XP desktop and laptop. i was running a program called hamachi on the dektop when it said there was an update. i clicked yes to download/install it. as soon as it had finished installing my internet stopped working. im possitive that my router and modem are both fine since this laptop is still working. I have tried rebooting from last known good configuration, but the last known good one was the time i restarted it right after installing the update. Also i have apparently turned off the system restore save points which is a mistake i wont make again.

Any other suggestions?