I don't know the particulars of your computer, but the usual way is to put the first recovery disk in the drive, restart the computer, and follow the prompts.If your computer isn't configured to boot from a CD, you'll have to change that in the BIOS setup program or press a key at boot time to select the CD drive.
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Soundproofing
Sound Proofing
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Soundproofing
Sound Proofing