Merijn, the creator of HijackThis recently sold the popular application used to remove malware to Trend Micro. In addition to improvements like support for Windows Vista, they’ve added a deceptively titled “AnalyzeThis” button. While the average user likely thinks the AnalyzeThis button provides helpful information for diagnosing their log, it’s main purpose is to send [...]
If you choose to purchase an upgrade version of Windows Vista to upgrade XP, you will no longer be able to use that version of XP. Either on another system, or as a dual-boot option. The key will be invalidated, preventing activation.
From Vista’s EULA found here (PDF) :
13. UPGRADES. To use upgrade software, you must [...]