Open My Computer, click the Tools menu, click Folder Options. On the
General tab, under the heading: Click items as follows, make sure that
option: Double-click to open an item (single-click to select) is selected.
If not, select that option, then click the Apply and OK buttons, then reboot
your system.
If you're talking about selecting text in MS Word:
A word
Double-click the word.
A line of text
Move the pointer to the left of the line until it changes to a
right-pointing arrow, and then click.
A sentence
Hold down CTRL, and then click anywhere in the sentence.
A paragraph
Move the pointer to the left of the paragraph until it changes to a
right-pointing arrow, and then double-click. Or triple-click anywhere in the
paragraph.
Multiple paragraphs
Move the pointer to the left of the paragraphs until it changes to a
right-pointing arrow, and then double-click and drag up or down.
A large block of text
Click at the start of the selection, scroll to the end of the selection, and
then hold down SHIFT and click.
An entire document
Move the pointer to the left of any document text until it changes to a
right-pointing arrow, and then triple-click.
Headers and footers
In normal view, click Header and Footer on the View menu; in print layout
view, double-click the dimmed header or footer text. Move the pointer to the
left of the header or footer until it changes to a right-pointing arrow, and
then triple-click.
Footnotes and endnotes
Click in the pane, move the pointer to the left of the text until it changes
to a right-pointing arrow, and then triple-click.
A vertical block of text (except within a table cell)
Hold down ALT, and then drag over the text.
A graphic
Click the graphic.
A text box or frame
Move the pointer over the border of the frame or text box until the pointer
becomes a four-headed arrow, and then click to see the sizing handles.
