Hello. I do Windows troubleshooting quite often as a PC Tech, and to be honest with you, you won't be able to resolve this problem without re-installing (or repairing) your current Windows installation. What I mean is that until you get your hands on a Windows XP Install CD (or DVD) you won't be able to boot in Windows AT ALL. No safe mode, no nothing. For the record, how did you ever delete the contents of the Windows directory? A lot of folders must've not let you delete them, you should figured that out. Did you empty the recycle bin after doing this? Did you try booting to "Last known good configuration"? Anyways . . .
So, here's what you have to do:
1) Get a Win XP Install CD
2) Put the disk in, and turn on your computer. Press F2 as soon as your BIOS screen comes on, go into the Boot Order inside your BIOS, usually called "BOOT" and be sure your CD drive is higher on the boot list than your hard drive. It probably already is, this is just to BE SURE!
3) So you're going to "Boot from CD". Then wait about 5-10 whilst Setup loads the Windows files. Once the disc loads the content, it'll ask you to do one of 3 things, install Windows, repair a current Windows installation, or exit. You want to press R for repair.
If repairing doesn't work, you'll to re-install from scratch, and if you don't want to lost any of your documents, you'll need to either install to a new partition, or create a new partition and install to that. Otherwise you'll just overwrite everything. Oh, and NEVER EVER DELETE ANYTHING FROM THE WINDOWS FOLDER, OR ITS SUB DIRECTORIES AGAIN!