It looks like Editing those settings has been disabled via a system policy.
if your getting that message on a stand alone workstation and you are in the same group as the administrator, I can't help you because the policy editor will probely be disabled.
If you are part of a Windows Domain and the policy is applied via the domain you need to edit the applicable policy in active directory
the policy editor (the gp stands for Group Policy) is "gpedit.msc" just type that in the run box
IBM/Lenovo T43 2687DSU
Pentium M 2.0Ghz
1024 MB (DDR2 SDRAM)
80 GB Ultra ATA, 5400 RPM
Windows XP Pro
64MB ATI MOBILITY RADEON X300
Integrated 802.11A/B/G, Bluetooth, 10/100/1000 Eth.