If it's formatted as FAT rather than FAT32 then that's a big problem because the partition would be limited to 2GB. But if it's FAT32 then it's not all that bad. You can check the technical info by opening the Administrative Tools in the Control Panel, opening Computer Management, and then selecting Disk Management.

That window can tell you what partitions you have and if any of them have extra free space available. If you have multiple partitions and free space on some of them then a program like Partition Magic can move the empty space from one partition to another without losing your data. I use it all the time and it's not too difficult once you understand how partitions work.
If you're currently using FAT32 then Windows XP can convert it to NTFS. You may end up with some extra disk space after the conversion.
But if you really need extra space then adding a new hard disk isn't that difficult if you can follow directions. It does require that you open up the case and fiddle around with cables and jumpers a bit. You also have to make sure that your machine can handle an extra hard drive. You can set up the new drive as additional storage or you can copy the data from your current hard disk onto the new hard disk and then remove the old one. You'll spend an evening getting it done (or longer asking questions on this forum if you don't understand the directions).

That window can tell you what partitions you have and if any of them have extra free space available. If you have multiple partitions and free space on some of them then a program like Partition Magic can move the empty space from one partition to another without losing your data. I use it all the time and it's not too difficult once you understand how partitions work.
If you're currently using FAT32 then Windows XP can convert it to NTFS. You may end up with some extra disk space after the conversion.
But if you really need extra space then adding a new hard disk isn't that difficult if you can follow directions. It does require that you open up the case and fiddle around with cables and jumpers a bit. You also have to make sure that your machine can handle an extra hard drive. You can set up the new drive as additional storage or you can copy the data from your current hard disk onto the new hard disk and then remove the old one. You'll spend an evening getting it done (or longer asking questions on this forum if you don't understand the directions).