Reading back my post, I noticed that I badly explained my problem.
From my Win 7 PC, I try to map a shared drive, and to simplify the problem, let's say that the shared drive is on an XP system (in fact I cannot map any shared on any OS). I can map this shared drive from another XP system.
My problem is not to map some data on the Win 7 PC
Computer type PC/Desktop System Manufacturer/Model Number Self Built OS Windows 7 Ultimate X64 SP1 CPU Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz Motherboard Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz Memory 8GB 1333Mhz DDR3 Graphics Card NVIDIA GeForce GTX 460 Sound Card Realtek Monitor(s) Displays Acer Al1980, Screen Resolution 1360*768
Keyboard Alba USB Mouse IT Works Wireless USB PSU 750W Cooler Master Case Cooler Master Haf X Cooling Cooler Master Hyper TX3 Hard Drives 500GB SATA WBC
1TB WD Caviar Green
80GB IDE Samsung Internet Speed 12Mb/s Down 1.2 Mb/s Up