Share folder between local machine and virtual box

My local machine is Windows XP and virtual box is Windows server 2003.
I need to map my local share folder to the virtual box.
1) Click virtual box,  in Windows Server 2003 power off, select General, select setting
and share folders, add C:\VMShare
2)Power  on virtual box  (Windows Server 2003)
3)  in Machine menu, click insert ctrl+Atl+Del, input Windows Server 2003 password
4) Right click My Computer, click map network Drive, Drive Z: Folder
\\vboxsrv\VMShare
5) Click My Computer, you can see the z: drive

Reference:
1) http://news.softpedia.com/news/How-to-Fix-Windows-7-Sharing-in-VirtualBox-123021.shtml
2) http://stevesmithblog.com/blog/shared-folders-in-virtualbox-on-windows-7/