Open Word /Excel, right-click your existing toolbar, and tick the 'pdfmaker' toolbar.
Or, create your document in Word ? Excel, choose File / Print, and select the Acrobat Distiller as your printer. This will 'print' your document to a pdf file.
If it is not listed, you will need to reinstall Acrobat, and make sure you enable the Distiller and Office Plug-ins. Acrobat only installs the plug-ins automatically if it detects Office on your system, so if you installed Acrobat first, the plug-in cannot be installed.