For XP, you may now have to download and install the VC9 runtime file from here:http://www.microsoft.com/download/en/de ... px?id=5582
Can you copy and paste the relevant section from the xampp-control-3-beta7.log file found in the xampp folder?
The XCP3 checks all XAMPP related ports when it starts and can be found in the top right Config button under button Services and Port Settings.
Check the ports actually in use by using the Netstat button and see if it is true that inetinfo.exe is using port 25
IIS has an SMTP service.
How did you disable IIS?
If you click on the Details button when you highlight IIS it shows you all the IIS items and one is the SMTP Service.
Make sure that when you have disabled IIS that there are no ticks in any of the boxes.
These instructions may help
To disable IIS
go toStart>Control Panel>Add or Remove Programs
on the leftmost side you will find an optionAdd or Remove Windows Components
click on it and then uncheckInternet Information Services (IIS)
You can select Details and make sure all IIS components are unchecked.
and then restart your computer.