Stuff: I have the same setup myself. W2 did import my W1 save so . . . checked my path for W1 saves and it is as follows . . .
[drive letter]:\Documents and Settings\[username]\My Documents\The Witcher\Saves
I would also post in the W2 forum and open a help ticket with GOG support. My install did find and import the save but I can see no benefit in doing so at the moment . . . =)
FOUND THE SOLUTION!
Jump to this thread
http://www.gog.com/en/forum/the_witcher_2/witcher_save_games/page3 and read the post by Yakkuz. It involves downloading the Witcher save editor (be sure to get the right one for your version... original or Enhanced...) and also requires that you find someone who has uploaded a savegame that is known to import properly in The Witcher 2. There is one uploaded by Corylea in that same thread.
I found the Witcher Editor here...
http://sites.google.com/site/ronsworkspace/GameUtilities/witcher The problem has nothing to do with folders, or folder names (well provided you have your saves in the right place). The problem is... there is a quest called "Ashes of Vizima" that sometimes does not get "Completed" and is stuck in the "Started" phase. Once you get that quest moved to the "Completed" phase, The Witcher 2 will recognize it!
I just took my very last save, in the Order of the Flaming Rose, and "patched" it to fix the Ashes quest... and now TW2 recognizes it just fine! Big thanks to Yakkuz and Corylea for pointing the way!
UPDATE: would you believe... I can't mark my own reply as the "solution" to a post? So I marked "Stuff"'s thread as the solution, and hope you'll read this one for mo' info! :)