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I have four to five computers with an OEM pack with same licence key. All these computers have activated Windows installed on them.

  1. Do I need only one licence key for upgrading all these computers to Windows 8?
  2. If during installation I get the error message 0xc0000260 (i.e. hardware incompatible), can I use the upgrade key purchased with this computer on some other computer?
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  1. you must buy 5 keys
  2. 0xc0000260 means the CPU is not supported. Make sure the CPU supports PAE, SSE2 and NX-Bit (make sure the NX Bit is enabled in the BIOS).
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