XP Tablet system (SP2, all current updates), no issues with prior versions (12.4.0.0 last used). All commonsense fixes attempted with no resolution. No errors during install.
ADDITIONAL INFO
On mouseover of tray icon, tooptip displays: "No supported WiFi adapters available in the system." All programmatic functionality, save Help, is greyed-out, both when Windows is set to manage and Windows is unset to manage. Problem persists identically despite reboots, Add/Remove Repairs, reinstalls, full uninstall/clear tempdirs/safemode/Driver Sweeper/reboot/reinstall; no obvious registry miswriting or corruption; prior releases for over a year have all functioned perfectly deployed in same manner.
VERSION DETAILS
3945ABG adapter driver is version 12.4.0.21, and works when OS-managed.
PROSet/Wireless component drivers (installed per 12.4.0.0 PROSet/Wireless WiFi Connection Utility package) as follows:
DrWiFi.exe 12.4.0.0
EvtEng.exe 12.4.0.0
iCrdCll.exe 12.4.0.2
iWrap.exe 12.4.0.1
PfWizard.exe 12.4.0.6
S24EvMon.exe 12.4.0.10
wscwiz.exe 12.4.0.2
ZCfgSvc.exe 12.4.0.9
C1XStngs.dll 12.4.0.1
DbEngine.dll 12.4.0.0
IntStngs.dll 12.4.0.0
LSAWRAPI.DLL 12.4.0.0
MurocApi.dll 12.4.0.6
PfMgrApi.dll 12.4.0.2
pfQOSMgr.dll 12.4.0.0
S24MUDLL.dll 12.4.0.1
supplicant.dll 1.0.73.0
zlib1.dll 1.2.3.0
s24trans.sys 12.2.0.2
ConnMgr.dll 12.4.0.11
Logview.dll 12.4.0.3
manualdiag.dll 12.4.0.2
WiWiTray.dll 12.4.0.1
S24Trans.sys 12.2.0.2
As I am unaware of component versioning on a per-release basis, and the installer didn't complain, I'm assuming those are all the proper versions for that package.