well, let's see. Check your start Menu properties by Right clicking on the start bar, then selecting advanced. I am hoping that XP Home has access to the administrative tools group, if it does if you scroll down the list of displayed start menu Items, on should be administrative Tools. Select show in all profiles and see if you start menu has that group in it.
Off hand I don't remember the name of the MSC command, will look it up tonight and post it if you are unable to find it. Also check the local group policy msc, the command line is gpedit.msc, type that into the run line and see if a group policy msc comes up. If it does, check the admin templates for local pc and see if they have disabled the ability to see and use the administrative tools. If it is disable, reenable and follow the steps at the begining of this post to see them. Once you can get the admin tools group up there is a msc link there that says services, scroll through the services listing looking for microsoft firewall, and securtiy panel and have it stop the serivce, this will disable the firewall and security panel until you can test the programs you are having problems with. you can also disable the service through the properties tab.
Be carefull though, if you turn off a critical service, the system may lock or shut down.
Found this on the microsoft technet page:
Administrative Tools can also be opened from Microsoft Management Console, or by clicking Start, clicking Control Panel, clicking Performance and Maintenance, and then clicking Administrative Tools.
GW