Shoutbox

Hi, I just installed SP3 using Windows Update (I had XP SP2 Pro fully updated). Everything went fine, I restarted the PC and apparently everything fine after the desktop showed up (no error messages, etc). But after examining my system I found the following changes:
1) The address bar is removed in the main taskbar, so I tried Right clicking on the taskbar > Toolbars> but notice that the Address option has been removed in SP3. Any way to restore it?
2) Old Windows Messenger was reinstalled, so I uninstalled it.
3) Each time I try to open MSN Messenger an install window opens displaying that MSN Messenger is being restored, so I cancel the process and MSN Messenger opens up normally. Any way to prevent this reinstall from opening up each time I open MSN Messenger?
4) If I try to activate Error Checking after reboot (by right clicking "C" drive in My Computer-Properties-Tools-Error Checking) and reboot it won't go thru error checking, it will skip it. How to fix this?

All of the above issues promted me to uninstall SP3 from my system using Add/Remove Programs in Control Panel and now my PC is back to SP2 and everything restored and working normally. I'd like however to know how to handle the above issues to be able to update to SP3. Thanks.