In contrast if you have accidentally reloaded Windows on a faulty PC before recovery of your files you will need the most powerful, deepest scanning data recovery tool you can find. You will not be so concerned with preview as you may very likely have a quarter of a million files to recover and you will not want to look at them one by one.
Reloading Windows means that you have reformatted your hard drive and thus marked all the spaces those files occupy as empty. Luckily the actual file data is still present. A deep search of a reformatted drive will return well over 90% of the file information on that drive. This data can then be re-saved and reloaded onto the reformatted drive.