|If you mean upgrading from service pack 2 to service pack 3 ... then, you should be perfectly able to. Here is a download link:|
If the file will take too long to download, I think you can buy a CD copy of it for $5 off of Microsoft's website. You should have at least 3+ GB of free disc space, but otherwise I think you will be fine. All of your programs, files, and settings will be preserved when you upgrade, so don't worry (though it may be a good idea to backup anything important). Otherwise, I think you are in the clear for updating,
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Dell Dimension 8300
Intel Pentium 4 HT @ 3.20 GHz
4 GB RAM
Nvidia Geforce FX5200