How to delete messed-up iPhoto Library?

I transferred around 17,000 images from PC to a new iMac thru a network cable. On PC I was using Canon's ZoomBrowser to upload my photos.

After I transfered the photos, I noticed that some folders have different dates, others have two versions, 'slides' and 'thumbs'...

I suspect the reason for that is that I used to try all kinds of free image editing programs. It was fun, but all these programs installed something on my computer.
Almost all folders have at least these two files:
Thumbs.db & ZbThumbnails.info

Others also have photothumb.db & jpeggeri.dot ( it's from using Vallen Jpegger)

I want to delete the whole iPhoto Library with all the mess, and to transfer images from PC again, using a 2GB Flash Drive, to the desktop on Mac, few folders at a time.
And from there I'll transfer them to a new library.

Here are my questions:

1) How should I delete the iPhoto Library, to make sure nothing is left ?
Mine is: Finder>Places/user name/Pictures/iPhoto Library

OR: Finder>Places/user name/Public/My Pictures ?

2) Should I delete all these .db, .info, .dat files in each folder before transfer?
These may be the cause of problems..

thanks!

1) Finder>Places/Username/Pictures/iphoto library

2) delete everything

good luck

Remnember that when you get to the point of reimporting, if you want to keep the structure you had on your PC, you need to import folder by folder, if you import otherwise, you will end up with just one big file. Good luck!

Thanks,
I guess the best thing to would be to create albums on PC' desktop, by grouping number of folders into one folder. So when I bring it over to iPhoto, it's gonna be a ready made album.

This is my general thinking, from starting to understand how iPhoto structured.
Please give me points to consider when doing that ?

Thanks!