Here's the TL;DR version of this article: it is possible to upgrade an old XP machine to Windows 8 Pro. The key things to keep in mind are your machine needs to be properly prepared for the upgrade ...

Christopher Kowalczyk, the developer of ' SumatraPDF ', which started as a PDF viewer for Windows and has now evolved into a multi-format viewer that can also be used to read e-books and manga, looks ...