Do you mean Messenger service:
No need to pay for the fix.
For Messenger Service ads:
You need to install or enable a firewall: http://support.microsoft.com/?kbid=330904 http://www.microsoft.com/windowsxp/pro/using/howto/communicate/stopspam.asp
Disabling Messenger Service can be a good idea, but it does not solve
the real problem.
The ads are not the real problem, the ads are only a symptom.
The real problem is open ports that allow unwanted traffic into the
computer.
Disabling Messenger does nothing for the open ports.
The firewall controls the traffic.
Disable Messenger Service:
Start/Control Panel, click Administrative Tools, double click
Services.
Go down to "Messenger".
Right click "Messenger" and select Properties.
Then under Start-up select DISABLE
Click OK and follow prompts
To protect the safety and security of your computer:
Install or enable a firewall IMMEDIATELY, before connecting to the
internet: http://support.microsoft.com/?kbid=283673
Install ALL Critical Updates IMMEDIATELY.
Start/All Programs/Windows Update
Install an antivirus application
Update it weekly
Run it at least weekly
With a firewall. Those popups are really a warning that you have a leak in
your PC security. Just disabling Messenger is like sticking your head in the
sand while the danger goes by, so to speak. XP has a firewall, better yet,
get the free version of ZoneAlarm from the site below. http://www.zonelabs.com/store/content/catalog/products/sku_list_za.jsp?lid=home_zainfo
Go to control panel, administrative tools, services.
Scroll down to 'Messenger' in the right hand pane left
click. go to properties...select disable and apply.
You're done.