Here I type these instructions last week. It does work just follow it exactly. My system is a win98.
This will instruct you on how to install and play P2 from within a DOS window (Full-screen).
Open My Computer and right click on the CD-ROM drive that P2 is in. Choose Explore than right click on the Install.exe file. Choose Properties > Program tab > Advanced button. Check the "Prevent ms-dos base programs from detecting Windows" box and uncheck the "Suggest MS-DOS mode as necessary" box. Click okay, okay. Now double click the Install.exe file. You can now auto-detect the sound card and install this game.
Now you must do the P2 patch. Once this has been done, right click on the C:\DARK\DARK.EXE file and choose "Copy". On the Desktop right click and choose "Paste Shortcut". Now as before right click on the shortcut you just created. Choose Properties > Program tab > Advanced button. Check the "Prevent ms-dos base programs from detecting Windows" box and uncheck the "Suggest MS-DOS mode as necessary" box. Click okay, okay. You can now play P2 within a DOS window. No extra Autoexec.bat and Config.sys files.