Do I need Partition Magic?

I recently upgraded to Windows Me by default of purchasing a new computer with it pre-installed. I also added some saved programs & files from my previous computer which ran Windows 98 SE & had an harddrive of 15 GB . Now, my problem is..that some information such as “System Information” shows that I’m close to 15 GB (as well as some asst’d. others) while others (Norton is conflicting with both pieces of info)shows my actual “new” hard drive space of 75GB which I know is correct. Is this a partitioning problem or actually, a memory problem due to the transfer of saved files?