I have formated my system as soon i came to know that it got affected. and for more precaution i once in 30 days format my system so that even if their is malware it gets cleared, even i clear the partition and create new one so it is deep cleaned.
that's an overkill! you really don't need to format your computer every month. not to mention that full format of a hard drive is an intense operation which may even lower the lifespan of your hardware!
just learn more about security measures and you will be safe for a very long time on your hot computer and move all your bitcoins to a cold storage and never worry about getting infected and needing to format anything.