I bet I have one of the slowest computers here, but I like it.

Plus, I'm assuming "PC" also includes Macs?

In any case:
1.33 GHz IBM PowerPC G4 Processor
40 GB HDD
512 MB RAM
Mac OS X 10.5

I used to have an older HP tower with XP, but it died a year or two ago.

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Midna, My Princess...