XAMPP installation on Win 8.1 with UAC Warning

I am trying to install XAMPP win32-1.8.2 on Windows 8.1. I get a message saying

Because an activated user account User Account on your system some functions of XAMPP are possibly restricted.

I've tried to change the user account control settings but still the warning is there. And the Apache server does not start. I've also disabled my IIS but still, its not working. What should I do?

There are two things you need to check:

1. Ensure that your user account has administrator privilege.
2. Disable UAC (User Account Control) as it restricts certain administrative function needed to run a web server.

To ensure that your user account has administrator privilege, run lusrmgr.msc from the Windows Start > Run menu to bring up the Local Users and Groups Windows. Double-click on your user account that appears under Users, and verifies that it is a member of Administrators.

To disable UAC (as an administrator), from Control Panel:

1. Type UAC in the search field in the upper right corner.
2. Click Change User Account Control settings in the search results.
3. Drag the slider down to Never notifyand click OK.

open up the User Accounts window from Control Panel. Click on the Turn User Account Control on or off option, and un-check the checkbox.

Alternately, if you don't want to disable UAC, you will have to install XAMPP in a different folder, outside of C:\Program Files (x86), such as C:\xampp.