A problem with Itunes and adding music to library

Question

I've been using my Ipod touch for about a month now (recently purchased). I first connected my Ipod to my laptop, because my desktop needed a format and reinstall of the OS, so I wanted to be slightly organized with it. I finally got around to formatting the desktop to WinXP pro, and have all my programs installed successfully.
Here's the issue:
With my laptop, I could start Itunes, and I did NOT have every song I have as my library, only a few songs that I personally selected and added to library (by clicking on "CTRL+Highligh" or File-->Add file to library). When I did that, I could hold down CTRL and highlight up to 15-20 songs at once, and have them show up in my library as added, then sync them to my Touch.
Since coming to my desktop with my Ipod, and moving all my music from my laptop over to my desktops C: drive, I've hooked up my Ipod and (of course installed Itunes) authorized my desktop for my Touch.
I begain selecting the music I wanted...My directory setup is as follows:
My Music: folders inside of
Itunes directory
Mp3 Directory
My Itunes settings are selected as My Music-->Itunes as the folder. I open Itunes, select add song to library, and it only allows me to highlight UP to 5 songs at once and add them. Any number between 1 and 5 songs will add to my library just fine. If i try to select over 5 songs, like 6-20 songs at once (using CTRL) it does nothing, and doesnt place any of the selected songs in my library. It will allow me to select individual songs just fine, and like I said, I can select UP TO 5 songs, highlighted with CTRL, and they show up just fine (all 5 songs will show in the library.)
Any number of songs selected with CTRL over 5, does nothing.
I dont understand why, when I used this very technique on my laptop, and I could select up to 30 songs at once (using ctrl+highlight) and they would ALL show up as they are supposed to. Everything is nearly the same on here, my settings are all pretty much the same as my laptop's settings were...anyone have any ideas? this has been bugging me all morning, and I've spent so much time fooling with it that I only have 56 songs out of 6,000 on my Ipod touch (I also decided to rid myself of music I didnt listen to and restored/formatted my ipod so I could start over)...I need more than 56 songs, but I dont want to do them 1 or 2 at a time, then go back and have to hit CTRL+O or File--->add file to library.
What causes me to be limited to 5 or less songs per time to add to my library?

Answer 1

Because I wasn't aware that the library could be "taken" from pc to pc. The processor on my desktop is also hyper-threaded, which simulates it having 2 processors..and moving file NAMES, not moving the files into the library is NOT a processor intensive function. It's actually just taking the file location - directory, and name, and making it show in the library..not moving the actual file itself and making a copy of it in the Itunes folder. I do NOT allow itunes to make copies of files that it keeps in the library (I uncheck allow Itunes to organize and make copies of files added to library).
So adding to my library is as simple as making the library show the file name, and pointing to the location on disk, not actually making a copy of the file in the background and placing it into a folder inside the Itunes folder.
Had I KNOWN I could take my library off the desktop and move it, I would've made it easier on myself, but I thought I posted that I just recently bought this Ipod touch (about a month ago).