When windows 2000 is preinstalled on a used computer, how much space does it take up?

The reason I am asking is that our computer was given to us by my company with around 4 GB of hard drive space. It was preloaded with windows 2000. However, we don't have much on it since we got the computer, yet it's almost out of space. We have tried all of the recommendations on how to clean out our computer.

My wife seems to believe that since it was originally a company computer, that they sometimes "lock off" space, that no one can use. In other words, there is free space available, but no one but the IT Administrator can access it?

Please advice in layman's terms. I am a novice.

Thanks

Minimum Requirements:

Computer/Processor: 133 MHz or higher Pentium-compatible CPU.

Memory: At least 64 megabytes (MB) of RAM; more memory generally improves responsiveness.

Hard Disk: 2 GB with 650 MB free space.

CPU Support: Windows 2000 Professional supports single and dual CPU systems.

Drive: CD-ROM or DVD drive.

Display: VGA or higher resolution monitor.

Thanks for responding, but I wasn't asking what is the min requirements. It was how much space does windows 2000 operating system take up?

Roughly, something between 500 MBytes and 1 Gigabyte. Depending on the whisles and bells that are installed.
There probably is a lot of junk left over on that computer, but if you're a newbe then it is not trivial to know the difference between unneeded and required files and folders.
First try a "disk cleanup":
START-PROGRAMS-ACCESSORIES-SYSTEM TOOLS-DISK CLEANUP
Select the disk (C), wait for the analysis to end, click ON every item and let it run.
If the result is not satifactory, you will need help from an experienced friend to uninstall programs and to delete folders that you don't need.

Thank you.

That's what I needed.