What is going on with the computer?

It asks start up repairs but after hours its
not repaired.System volume on disk is corrupt;

How do i ask a new instalation to
Microsoft? You have a kind of card with numbers under the computer with Microsoft logo.The key is pat erased. Do they ask the key or the other references?
Hoz
Update: How to reistal if you don t have the Windows CD?

2- Is Linux plug and play? For example to printers; modems etc?
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