He said he was using Windows 98. Windows 95/98/ME will support DOS applications out of the box. (Windows NT/2000/XP won't) After installing the DOS application on your Windows 95/98/ME machine, you can right click the execution file (whatever.exe) and you'll see there is a tab for DOS compatibility. Also check out this website for help on setting up Windows 95 or 98 for good DOS program compatibility and performance:
http://mvps.org/winmac/win95dos.html
Here's some info from that website:
Things you should try to get those "problem" DOS applications to work with Windows 95 or 98:
Note: Many users advocate booting your Win95/98 system to "old DOS" OR from a special boot floppy disk to solve problems with DOS applications. Windows 95 version OSR2 does not support dual booting old DOS as noted above. I contend that you should be able to set up your Windows 95 or 98 system to handle those DOS applications with Windows 95 or 98 succssfully as noted in the following paragraphs. If you follow these tips you should be able to "ditch" your "old DOS" files.
First-Try adjusting the DOS app's properties to run in a full screen "DOS Box": Go to the Properties for the DOS app-"Memory" and run it "Full Screen." Note: Depending on your system setup, Win95 may only provide 550-600KB of free conventional memory to DOS apps without tweaking around with it. If that is not enough, I suggest that you optimize your AUTOEXEC.BAT and CONFIG.SYS as noted below to provide max DOS conventional memory. If this techniquedoes not help-try checking "Protected" in the DOS app's memory properties. Note: It has been my experience that DOS apps that use a mouse suffer poor mouse responsiveness running in a full screen or windowed "DOS Box."
Second-Try running the DOS app in "MSDOS Mode" by adjusting the "Advanced" (Check "MSDOS Mode/"Use current MSDOS configuration") properties but only if you also optimize your AUTOEXEC.BAT and CONFIG.SYS files as noted below to maximize your free DOS conventional memory in the MSDOS Mode. If you have solid system startup files, you do not need to create custom autoexec.bat and config.sys files for each and every DOS app. Also, make sure nothing is loading in your C:\Windows\Dosstart.bat file.
Third-Try running your DOS apps from a bootup Win95/98 DOS Prompt: When all else fails, the "last ditch" method to run DOS programs that do not like being run in Windows 95 via any of the above methods is to simply boot your Windows 95 to a DOS 7.x prompt after tweaking your AUTOEXEC.BAT and CONFIG.SYS as noted below to attempt to maximize your free DOS conventional memory and solve any other strange video, memory or other problems. You then run the DOS programs from this bootup prompt, never actually going into the Win95/98 GUI.
I have found that if I run my "problem" DOS applications (especially games) from a bootup "DOS 7.x" prompt (That is what is under Windows 95) I have better performance and less problems largely because it gives the DOS app or game the entire machine by itself. I still frequently use many DOS applications and utilities and sometimes simply do not want to automatically enter the Windows 95 Graphical User Interface (GUI) every time I boot up my system. I realize that by pressing the F8 key when you reboot and see "Starting Windows 95...." this will cause the "Boot Menu" to pop up and you can select your choice (In this case it would be "Command Prompt Only") from there each time. My intent is to show you how to automate that process.