Took me a full day to get my Motorola Wireless Bluetooth Headset work with my dell 
Inspiron 700m. Try Try Try Again Magic seems to work pretty good for me.

This article is for specifically for people still struggling with setting up their 
Motorola HS850 Wireless Bluetooth Headset to work with Windows XP SP2 
Latitude 700m Laptops.


What U need ?

Hardware
A Bluetooth Adaptor : USB - D-Link DBT-120 / Belkin F8T001 / TRENDware TBW-101UB 
/ Linksys USBBT100
Bluetooth Headset : Motorola HS810 / HS820 / HS850 / Jabra BT250v / A 210

Software
MSI Bluetooth Software, Version: 1.3.1.
(Download Link : http://www.network-drivers.com/drivers/161/161139.htm)

Patch : BTWPatcher.exe I got the zip file patch_v4.rar from the net.