Change the number of mouse clicks required to open items

Open Folder Options in Control Panel.
On the General tab, under Click items as follows, click the option that you want.

note Note

To open a Control Panel item, click Start, point to Settings, click Control Panel, and then double-click the appropriate icon. Or, in Windows Explorer, click Tools, and then click Folder Options.
If you click Single-click to open an item (point to select), you can also specify how you want icon titles to be underlined.
To check your current browser settings, in Control Panel, double-click Internet Options, and then click the Advanced tab.