Thanks a lot ! I don't know why I believed it was a Renesas... Maybe driver's cd which was provided with the card ?
Checking...
Yes, it is !
Release Note May 31.2012
Renesas Electronics uPD720201 & uPD720202
USB 3.0 Host Controller Driver Kit (x86 and x64)
for Windows XP, VISTA, 7 and Server 2008 Release 2
And I used this Renesas driver when the card was on another 32 bits computer running XP... It was working.
So, I couldn't imagine to try another trade driver ! But, now it's working ! Without any reboot ! Wonderful !
So, thanks one more time.