Ahh I see now.
The security issues you bring up are easily fixed through software. Primarly a good anti-virus software (Norton, Mcfee etc), as well as a spyware cleaner software (like AdAware, google it you'll find it), as well as running all of your windows update stuff (Service Pack 2 will help tons here).
So if its just software issues you can put that on pretty much any laptop. IBM does have that niffty thumb scanner thing but there is not huge incentive for it. Basically you can set it up so you have to scan your thumb in order to log into the computer.
You could also consider a Mac based laptop since there are very few virui, and spyware for the Macs. However, I don't know a great deal about antivirus etc for macs.