|So it's a new computer running windows 98?|
Is it windows or dos software?
It needs 500 KB of ram or 500 KB of hard disk space? If it's not seeing the correct hard drive size it may be because the drive is FAT32 and the software is expecting FAT16, although that's usually not a problem. If it's ram we need to modify your config.sys and autoexec.bat.
Real men don't use AntiVirus; they just reformat