Date: 2011mar6 OS: Windows Q. Is there a replacement for Adobe Acrobat? It takes tons of disk space and memory and is always bugging me about updates. A. You can use PDF-XChange Viewer. It is faster and uses way less disk space. The basic version is free. Just be careful to say you do NOT want their toolbar when installing. http://www.tracker-software.com/product/pdf-xchange-viewer Firefox can natively read many PDF files too.