When you open device manager and expand the linksys miniport pptp you get the following message:
"Windows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory (Code 38)."
Thinkpad systems with Linksys miniport running Windows vista
A Driver release from have fixed this problem.
184.108.40.206 Driver date: 1/18/10
After installing this driver, under driver details the two files should show
netr28u.sys File version 3.00.10.0000
vwifibys.sys File Version 6.1.7600.16385