First of all, if someone is performing a DDoS on you, you can get rid of this issue by writing down your IP that the ISP gave you as a lease and then shut your modem off and contact your ISP to reset the lease for the modem so that you will get a different IP. After this you turn your modem back on and it is given a different IP address if the ISP follows through and resets the lease associated with your modems mac address bound to your account. You can then confirm this by checking that your IP has changed. A good website to check your IP address is the following:
http://www.whatismyip.com/I have some doubts that someone would have a problem with you so badly that they would go to this measure, but if this was the case, this would fix this DDoS issue.
I am curious as to what your pings are to
www.google.com from both the desktop and the laptop. They should be all around the same response times. Google is what i use as a reference when looking for connectivity issues outside of my ISP's domain. If a ping to my ISP is fast and yet google is showing issues then I know that eithert Google is having issues, the internet itself is having issues, or my ISP is having issues with its backbone to the internet.
Lastly, in order to pull off a DDoS attack, this person would have to have access to many systems at their command to target your specific IP address. Most threats like this are ill supported to follow through and target an IP address unless they have help from others who want to get involved and also target you. Generally a home user is not the target of such attacks and they are targeting a business or identity that causes big problems and draws attention to a group who pull off the attack.
I assume you have already scanned these systems also for malware etc and they are both clean?
