Other than Bricopacks, are there any other softwares I can download to make XP resemble Vista?
Does Bricopacks not work for you? I tried googling Vista themes, and several good looking answers popped up. Try a few of those sites?
Bricopacks are only useful if you want to change every single element of the operating system from booting images all the way to system icons. If you simply want to change the theme (meaning the appearance of the windows, task bar, etc.) you simply need to modify the uxtheme.dll file & install a Vista theme (you can find those on many websites including but not exclusively DeviantArt).