The best way to determine if your computer or SOHO router has been affected by DNSChanger is to have them evaluated by a computer professional. However, the following steps can help you gather information before consulting a computer professional.
To determine if a computer is using rogue DNS servers, it is necessary to check the DNS server settings on the computer. If the computer is connected to a wireless access point or router, the settings on those devices should be checked as well.
Checking the Computer:
If you are using a Windows computer, open a command prompt. This can be done by selecting Run from the Start Menu and entering cmd.exe...