Verifique a etapa 7 no URL abaixo sobre como usar o eclipse no ambiente Winodws link
Once you have downloaded the Eclipse archive you will need to decompress the zip file, which will create the unzipped Eclipse folder. You may want to extract the archive to the root of C:\ drive, thus creating the folder “C:\eclipse”, or just moved the extracted eclipse folder to the root of C:\ drive if you extracted it already. Since Eclipse does not have any installer, there will be a file inside the Eclipse folder named eclipse.exe. You can double click on the file to run Eclipse.
Eu também não encontrei nenhum instalador de eclipse ou arquivo de instalação para windows. Então parece que esta é a maneira mais comum de começar a usar o eclipse no windows.