- Exposure of confidential information due to new security vulnerabilities
- Degradation of performance due to unresolved software issues
- Inability to support new hardware due to lack of driver support
- Destruction of critical business information by malware
In either case you must know that you cannot upgrade from Windows XP to Windows 7 or 8 directly. You must perform a new install and then re-install all programs, devices and import your data and settings.
The following links from Microsoft describes the upgrade process for XP to Windows 7. However beware that if you follow this process you will in all likelihood end up with a 32 bit version of Windows 7 or 8. You don't want this. Literally 99 percent of Windows XP installations are 32 bit. A 32 bit OS limits your computer to 3 to 4 GB of addressable RAM (memory). For this reason alone users should want to upgrade from XP since this limitation affects both performance and capabilities of your machine.
http://windows.microsoft.com/en-us/windows/end-support-help
http://windows.microsoft.com/en-us/windows7/help/upgrading-from-windows-xp-to-windows-7#T1=tab01
A better explanation on the steps that should be considered before upgrading is found at the link below. This article addresses the first obstacle in performing an upgrade and that is whether your existing machine is capable of running Windows 7 or 8. It also discusses hacks and options you can employ to enhance your computer's performance and user experience.
http://lifehacker.com/how-to-move-on-after-windows-xp-without-giving-up-your-1556573928
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