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#11
The reason people are suggesting a format/install is because there could be (most likely are) leftovers from the infections on your PC. This is a problem if you ever plan on doing anything like banking or stuff like that. Your passwords probably aren't safe either.
I really hope you found a very comprehensive tutorial because if you aren't thorough, you may seem like its not infected anymore, but I see professionals who remove malware/viruses that leave some traces behind.
Can you provide the link you used to remove the threats?