XP issues with connectivity

Good evening all,
I am having some issues with a recent run of XP upgrade.
In the end, I was left with several recurring error messages when trying to access the internet or trying to receive e-mail including:
1. iexplore.exe - entry point not found: The procedure entry point SHRegGetValueW could not be located in the dynamic link library SHLWAPI.dll
2. MSNMsgr.exe - entry point not found: The procedure entry point CreateInfoWindow could not be located in the dynamic library MSOERT2.dll
In the process of trying to find a fix I also managed to delete the microsoft system management BIOS driver
I think I need to dowload the service pack 2 in order to begin to fix things, my problem is I can't access the internet on my desktop (only via the laptop) I am typing this message on right now.
I'm getting pretty frustrated right now after working on a fix for over 8hrs and desperately need some advice.

You can download SP2 just as you would download a program (the WinUpdate site is just an alternative): http://www.microsoft.com/downloads/details...;displaylang=en

Just click the Download button and save it to your hard drive. Don't bother reading any of the verbiage on the download page.

Some reading that should be done by anyone before installing SP2:
Get Your PC Ready for Windows XP SP2 - http://www.microsoft.com/windowsxp/sp2/sp2_whattoknow.mspx

Louis