Proxus,
If you use anything like OL or OLE for email, you will need to use the OL or OLE backup program and save your data.
To do a fresh install of Win2k you need to boot from the Win2k CD (or with the Win2k Floppy's). When it gives you the option, tell it to do a new install. Then use the current partition, when it asks to format tell it to use current file system instead of formatting. (Very Important. If you format, all your data will be destroyed.) When it asks which directory to install in, tell it to use the current one your OS is in. It will warn you that you are installing over your old OS, you say ok and do the install.
That way only your Windows Directory will be overwritten and all the rest of your data will still be there.
Take Care,
Richard
P.S. It would be a good idea to copy any data in your My Documents Folder, just in case.