There are some spurious spaces in the error message you quote.
Anyway, something is needed that isn't contained in your Windows 98 installation. It came only with Windows 2000 and later.
- conclude the AV-program isn't compatible with Windows 98, return it, get your money back and find another one instead (good free ones are free avg, avast! and antivir)
- ask the makers for help and support (if they state Windows 98 is supported)
- try: download shfolder.dll from http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=6AE02498-07E9-48F1-A5D6-DBFA18D37E0F. The dll should be placed in c:\windows\system, and possibly must be registered with regsvr32.exe (like this: http://www.ss64.com/nt/regsvr32.html)
Hope this helps.
When i attempt to open a download for a anti-virus program that i purchased on line this is the message i get (error starting program) the installer tsp2005(1).EXE file is linked to missing export shell 32.DLL shget folder path A. (windows 98se) don't understand how to correct problem. (help)