Assuming you will be reinstalling Windows 7...what medium will you be using to do that? Doing a clean install
will reformat the drive.
Did you find the malware that compromised the router?
Do you need to allow remote access to your computer? If not, you should go into the router and change the settings
to prevent remote administration/ access. While in the settings, check that the firewall is active and set a new strong
password. Very important to get the latest security update for your router.
It is possible if your computer is networked with other computers such as your place of business that the entire network
was compromised and not necessarily by malware that originated on your computer.
Here is a link to an article I read this morning pertaining to your problem.
Users face serious threat as hackers take aim at routers, embedded devices | PCWorld
Copied from article: ......Many users are often the bigger problem because they don’t even change the default admin password on their devices, leaving the door wide open for attackers.......
For those users who do feel knowledgeable enough to configure their own routers, Eiram advises disabling access to the administration interface from the Internet, as that is usually the most commonly vulnerable feature.
“Ensuring other services are not remotely accessible is also a good idea, since we do see vulnerability reports in those as well,” he said. “The problem here is that it is sometimes not even clear to users that a service is active and listening remotely. Finally, checking for updates regularly is important and usually possible from within the the web-based management interface.”........