I was trying to install NS2 on my machine and it kept kicking me out of the installation. Finally i figure out the space in my computer’s name is doing that. And here is the way if you need to change the PC Name/as put in at the installation of the OS:

1. Begin by first clicking on the Start Button.
2. Then click on the Run Icon, which will open up the Run Menu for you.
3. Type the word “Regedit” into the white area and then click on the OK button.
4. Click on the plus sign [+] next to HKEY_LOCAL_MACHINE to expand that section.
5. Then click on the plus sign [+] next to “Software” to expand that section.
6. Then click on the plus sign [+] next to “Microsoft” to expand that section.
7. Then click on the plus sign [+] next to “Windows NT” to expand that section.
8. Then click on the yellow folder entitled “Current Version”. Do not click on its plus sign
[+].
9. Now move over to the right side of the screen and scroll down until you see “Registered
Owner”.
10. Double click directly onto the words Registered Owner and input your new name,
make sure no space there.
11. You need to reboot your computer for the changes to take effect for Windows XP.

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