Access is Denied When attempting to load drivers

I have been attemptin to install a USB to serial port
converter on my IBM 2724 laptop. I am running WinXP pro
and when I attach the device to my laptop the system
recognizes it but as it goes to load the drivers I get the
message "An error occurred during the installation of the
device Access is denied". I have attempted to load the
device on another XP machine and it loads fine. I
contacted IBM butthey were of no help. It sounds like a
permissions snafu, but I can't find any items in the
Knowledge base that addresses this issue exactly.
Hopefully there is someone out there who has had this
problem.

Thanks in advance for any help you might be.