Okay, in this case.. wipe means to format, which will erase all your data, the operating system, everything. Everything on your system is now gone. Now, yes, you do need an operating system. If there was a disc that came with your computer, you can use that or your going to have to purchase an operating system. You can get them off of newegg.com or amazon.com, search for the OEM product, they will only be about $112 I love Compaq Presario's, it was the first computer I ever owned.. it lasted 12 years.. granted I upgraded it and things, but the original board, memory, processor, everything lasted.
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