To install ArcaVir version for older Windows system (98, ME and 2000) using ArcaVir 2011 DVD, you should:
1. Instert ArcaVir 2012 DVD to a CD/DVD drive
2. Open „My computer” window
3. Click with the right mouse button on CD/DVD drive icon and select Open or Explore
4. Then go to the directory: \Install\ArcaVir98ME2000\Setup\
5. Run the file: ArcaSetup98ME2000.exe that will install ArcaVir for older Windows systems.