In technical discussion sections, you should be responsible for what you recommend. Re-install operating systems (e.g. Windows) or even re-formatting harddisk (harddrive) is always the last resort.
If you don't know a better suggestion or solution, please keep quiet. Straight telling people to re-install operating system or re-format harddisk is an irresponsible behaviour, and such act is not allowed.
Suggesting re-installing operating sytems or re-formatting harddisk should only be conducted when all possible solutions have tried and you are very sure re-installing is the only way to try.