You are likely to be in trouble w/ the TV. France uses a completely unique television system called SECAM which was used by France, French speaking countries in Africa, and the old Soviet Union . That has been superseded by modern digital formats, but I would guess that if you plug in a signal into a composite input, it would be expecting SECAM signals. A modern digital TV might be "smart" and be able to decode a variety of signals, though. You'd have to check the manual.
The power converter should work OK (I think), but make sure you have enough watts. The computer itself probably uses up 15-20, but a disk drive can use up the whole 45 watts of that converter on its own. Just as a warning, when I worked at Radio Shack many, many years ago, we were told to advise people who would use these foreign converters that they shouldn't be used for "sensitive electronics." I'm sure that was to protect the company more than anything, but just letting you know that there might be some risk. Make sure the converter you get is OK with electronics.
EDIT: Ah, you may be in luck with the TV thing. According to Wikipedia: "Most TVs currently sold in SECAM countries support both SECAM and PAL, and more recently composite video NTSC as well (though not usually broadcast NTSC, that is, they cannot accept a broadcast signal from an antenna)." You'll need a newer TV for this, and you'll need one of those monitor cables that has a composite plug in the end like they sell on ebay.
Edited by lord_mike, Thu Aug 6, 2015 10:07 AM.