Which Anti-Spyware do you prefer?

I like the MS-MA and have used it on several different machines as well as different OS's but am having a problem with it on A Dell 4550 with this happening when I am attempting to download and install the anti-spyware
> beta. When I start the install I get a InstallShield box
> pop up that states
>
> " Command line parameters
> /L language
> / S Hide initialazation dialog. For sile mode use /S
> /y/qn
> /V paramatersto MisExec.exe
> /UA<url to InstMsiA.exe>
> /UW<url to InstMsiW.exe>
> /UM<url to msi package>
> then a OK button"
>
> When I click the OK button the install stops. What do I
> need to do to get the command line paramaters box to
stop coming up and be able to install with a regular GUI
and be able to complete the
> install.
>
> Thanks
> Andy