Just follow this step by step procedure to discover whether your PC could run Vista smoothly
There is a way to check how complex upgrading might be. Before installing Windows Vista on a current Windows XP system, you are well advised to check whether your PC has the brute strength to run it. Beyond checking the headline system requirements, you can download the Windows Vista Upgrade Advisor. This is a small application that scans your computer hardware and reports accordingly.
You can download the Upgrade Advisor tool from here. As the opening screen recommends, connect as many of your external devices as possible, including hard drives. Initiate a scan and leave well alone for a few minutes.
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