Can Wine emulate Windows95?

If you're running 64-bit system, you'll need to create a 32-bit wine prefix to mimic older versions of Windows (older than XP).

Specify the arch, and a new path to use for the prefix:

WINEARCH=win32 WINEPREFIX=/path/to/wineprefix winecfg

Configure Wine for the application as needed. There will be more Windows versions listed. Then run:

WINEARCH=win32 WINEPREFIX=/path/to/wineprefix wine virus.exe

Or whatever it is that you need to run.

You can use winecfg to modify the default version of Windows emulated or to modify settings for specific executables.