It would appear that WinBubble is written for Vista.
<hr>However, looking at this utility, I can see where it might be used for XP as some of the mods/tweaks are identical in XP. You would have to actually try it to determine its compatibility with XP. WinBubble doesn't have an installer . . . you simply extract (copy) the zipped files to a folder and location of your choice. To uninstall, simply delete the folder.
If you're a beginner in computers, and by incidence you've stumbled in this website. One way or another, you'll have a difficulty in applying some tweaks because of the brittleness of Windows settings.
Two Clicks, "Check and Apply"
In just two clicks, WinBubble will help you to Customize and Tweak your Windows Vista easily. Its features cover Customization, Security and Optimization.