First if your OS is 64-bit then you need to use the 64-bit driver as listed on the ndiswrapper known working devices list, try using this one;
ftp://ftp.support.acer-euro.com/note...bit/80211g.zip
$ ndiswrapper -v
utils version: 1.8
driver version: 1.16
vermagic: 2.6.16.20 gcc-4.1
$ ndiswrapper -l
Installed drivers:
bcmwl5 driver installed, hardware present
00:0b.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
Subsystem: AMBIT Microsystem Corp. Unknown device 0312
Flags: bus master, fast devsel, latency 64, IRQ 22
Memory at e2000000 (32-bit, non-prefetchable) [size=8K]
$ uname -a
Linux Aspire5000 2.6.16.20 #1 Mon Jun 5 20:01:27 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux