You can't delete the whole Windows folder from the c: in a Windows XP installation. And there's no need for any Windows folder on a external hard disk, so whatever you delete there isn't important.
So it's not clear what you did. And so it isn't clear how it can be fixed either.
And a detail for when you've fixed it: you can't format a drive. You partition a drive and you format a partition. Use Disk Manager in Windows XP for that.
Hope this helps.
Hey i recently got an external hard drive case for my old hard drive. I already copied everything off it. but then i wanted to format it because it was in 3 partitions and i wanted a back up drive but i accidentally went though and deleted everything including the folder called :windows with all the .sys files. so now my external drive wont register and i cant find it let alone format it.Any one know how to fix this problem?