The T41 has IBM Integrated Bluetooth II, not III.

Any suggestions? I tried to do what you suggested and buggered up my Bluetooth devices and had to back out of the change.

Any advice is truly appreciated!

I downloaded bthwxp1o.exe IBM Integrated Bluetooth II from Lenovo for my machine and after the obvious install from BTW.msi failed, I looked on the web for discussions like this.

I could not get the above hjl’s hack to work on my machine, though I tried all sorts of variations. I finally succeeded by using the below instructions 1-23 from Lenovo exactly, after I restored the BTW.INF and BTW.PNF files.

That’s what worked for me. I don’t remember such a miserable install process since the old IRQ conflict days.

============================
II. Installation instructions
Notes:

* If any previous or current Integrated Bluetooth II Software is already installed on your ThinkPad, uninstall the software in Add/Remove Programs in Control Panel before installation.
* Do not turn on the Bluetooth power before you complete the Bluetooth software installation.
* During the installation, do not touch the keyboard, the TrackPoint, or the mouse.
* ThinkPad Software Installer provides an install/uninstall wizard for this package. Before using the ThinkPad Software Installer, you must uninstall the previous or current software using Add/Remove Programs in Control Panel or using the ThinkPad Software Installer.
* In the Windows XP preload environment, the Microsoft Bluetooth software is installed. You can install and use Integrated Bluetooth II Software, but you can use only one of them at a time.

1. Start Windows, and for Windows 2000/XP logon with administrative privileges.
2. Extract this package to the hard drive.
3. Click Start, then click Run. In the Open field, type C:\DRIVERS\WIN\BDCACT\SETUP.EXE and click OK to install the Bluetooth software. If you extracted the files to a different location, specify that location instead.
4. In Welcome to the InstallShield Wizard for Integrated Bluetooth II Software window, Click Next.
5. In the License Agreement window, read the License Agreement carefully, if agreed select I accept the term in the license agreement then click Next.
6. In the Destination Folder window, just click Next. (If you need to change the destination, click Change, select or enter the destination folder you like, then Click OK.)
7. In the Ready to Install the Program window, click Install.
8. When Driver Signature Notice window appears, click OK.
9. When InstallShield Wizard Completed window appears, click Finish.
10. If you asked to restart the system, click Yes to restart the computer.
11. After restarting the computer, turns on the Bluetooth LED and loads the Integrated Bluetooth device driver.
Note:
On Windows XP with Microsoft Standard Bluetooth software installed, you must perform the following steps in order to complete the installation of the Integrated Bluetooth II software.

12. Turn the Bluetooth power on.
13. Click Start, select Control Panel.
14. Click Performance and Maintenance, then click System.
15. Click the Hardware tab, then click Device Manager.
16. Double-click Bluetooth Radios.
17. Double-click Integrated Bluetooth II.
18. Click the Driver tab, then click the Update Driver… button.
19. Select Install from a list or specific location then click Next.
20. Select Don’t search. I will choose the driver to install, then click Next.
21. Select the driver without the Digital Signed icon, and click Next.
Note: If you do not see the driver that is not digitally signed, click “Have disk”, then enter “C:\Drivers\WIN\BDCAT” in the “Copy manufacturer’s files from:” box, click OK, then select Next.
22. When a pop-up window appears, click the Continue Anyway button.
23. Click Finish to close window.

http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-50245