I read a couple of tutorials which explains how to setup a dual-boot system with Linux and Windows. However, all of them suggest that Windows is already installed on the system and Linux will be installed next to it.

Is it possible to install windows 2000 after Linux is already at the system?
And when yes, will there be any complications or should I pay attention to something special?

Appreciate all your help, thanks in advance...

Yes, it is possible to install Windows after Linux. However, expect to lose Lilo or Grub - Windows does not play well with others and will overwrite your mbr. Windows also prefers to be first on the disk and may well have problems after install.

If you really need to do it this way, keep your SuSE disk1 (or rescue floppy) to hand so you can reinstall your bootloader and have your Windows disks to hand in case it loses files that it needs.

Personally, as long as I hadn't tweaked or added or saved too much to SuSE, I'd pretend I never had it installed and do Windows first and SuSE second.

And, of course, Welcome to LQ

Good luck.

First you need to ensure that you have enough space on two separate partitions.You can install Win 2000 first,but I suggest that you install Linux first.Sometmes the Windoze install can wipe out the Grub loader.BTW,you didn't specify what flavour of linux you are planning to setup,so I assume it's gonna be either Fedora or mandrake,coz these are perfect for newbies to Linux.
After you partition the hard drive,you need to have a swap and a root partition for your linux system.Swap is usually twice the amount of system memory.Root is the partition where your linux system is installed.Although you could also give a thought to having a boot partition.It should be somewhere about 50-75 megs,but it is okay if you have a 10 or 15 meg one.Fedora comes with a very easy disk partitioning tool disk druid.Choose manually partition the HDD option and creat the 3 partitions.Rest is just too easy.You now have a linux system ready to use.
Now install Win 2000 with the install media required and you have a dual boot system.But I seriously advise you to install Windoze first.Also format the Win partition with Fat32 and not NTFS.This allows Linux to access Windoze.

Okay, thanks a lot both of you, this is really usefull information for me.

To give you some more background information: I had to order a Dell workstation and they also offer to install Redhat Linux enterprise WS on it. So this would be an advantage for a newby like me not to bother with a linux installation for the first time. However, win2k should also be used on it. Therefore I preffered to let Dell install Linux and install Win2k afterwards myself, so I don't have to bother about the Linux installation.

So I think I will just order Linux on it and first try to install Win2k next to it with the advice you gave to me. If this won't work, I can still format the complete system and start all over again the other way, nothing to loose yet for me.

Thanks again for the help, this is really a great forum...

As I have read that loading Windows after Linux might cause problems, and that's what happened with me. We had installed Red Hat Linux 9 and made partition for Windows. After that I tried to install Windows 2000. It got installed but now while booting the PC shows only one option for OS i.e. Windows 2000, and there is not trace of Linux. Is there some way to get back the installed Linux.