(2005) Saved Image not readable by MS Photo Editor

[GPerk]

When my program reads a JPG file, draws some text on the picturebox, and saves the file, the saved file is not readable by MS Photo Editor. It IS readable by MS Explorer, MS Word, & PhotoImpact. When I copied the saved files to a USB thumbdrive and tried to print the pics at CVS, they were not readable.
Here is how I process each file (PB is a picbox inside a Panel):
READ:
Dim PicIN As Image = Image.FromFile(txtFolderIN.Text & txtPicNameIN.Text)
PB.Image = PicIN
DRAW:
Dim bmap As Bitmap
bmap = New Bitmap(PB.Image)
Dim g As Graphics
g = Graphics.FromImage(bmap)
Fontsize = txtFontsize.Text
g.DrawString(txtRootName.Text, New Font("Arial", Fontsize, FontStyle.Bold), Brushes.Yellow, _
txtXdraw.Text, txtYdraw.Text)
g.DrawString(txtDateTime.Text, New Font("Arial", Fontsize, FontStyle.Bold), Brushes.Yellow, _
txtXdraw.Text, txtYdraw.Text + CInt(CSng(Fontsize) * 1.5))
PB.Image = bmap
g.Dispose()
SAVE:
PB.Image.Save(FolderOUT & PicNameOUT)

I have noticed that the "Date Pic Taken" in the JPG file header is missing after I save the new file - perhaps something else is being trashed.
When I read the new file with PhotoImpact and save it, then it IS readable by MS Photo Editor. But I have over 400 pics from a trip to Norway, and I grow faint if I think about doing that to all 400.
Any guesses about what is causing the problem?
Or other suggestions?

 

[GPerk]

By doing a binary dump of saved image, I found that it was being save in the .PNG format. That means 2 things are wrong:
1. My version of MS Photo Editor cannot read a PNG format image
2. The default PB.Image.Save format is PNG.

This was fixed by changing the last source line in my original post to:
PB.Image.Save(FolderOUT & PicNameOUT,_
Drawing.Imaging.ImageFormat.Jpeg)