Happy New Year, @KingMalik98!
In addition to what @velocityg4 mentioned
, I'd strongly recommend you back up all your data from the external drive on the Macbook, since you are able to access it from there. After making a duplicate of the files stored on the external HDD, you would be safe to re-format it in exFAT or FAT32 as it was already suggested. You could do this on the Macbook as well by
Re-formatting the HDD through Disk utility or you could do it through the Windows laptop in
Disk management. However, I'd strongly advise you to check some of the
File & Partition size limitations that come with the FAT32 file system.
Hope this helps you. Good luck!

SuperSoph_WD