For me personally, formatting is always the last option.
If you have access to another computer and a USB memory stick to transfer the necessary logs across then I would advise trying to save your system first by following the link above as advised by Glaswegian. Re-installing may be the quickest option but then you loose all data stored. By the time you have re-installed software and reinstalled personal data then it is not always as quick as it seems. Just a little patience goes a long way.
Iif you should choose to format, then that is your choice alone. I have placed advice below for you to read first to help you decide
Reformatting Considerations
When Should I Format, How Should I Reinstall?
Good luck!
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