|To recap, the CD is not the important part. The key is. If you sold PCs with WinXP installed using those keys then reselling them is a violation of the EULA with Microsoft. Those PCs were running WinXP weren't they? I would assume they are registered. That makes THEM the legal owner of that license. |
If you are saying that three of four keys have never been used then why would you have the CDs and why are they open. You no doubt installed them to various computers that were in use and are now owned by others.
I would advise you not to attempt selling those licenses.
If you use computers you could try to install them on one of your machines, one by one and attempt to register them. If they register OK then you could go though the process of unrigistering them and at that time it may be safe to sell them.
If you sell now and the key is already in use that would be fraud on your part.
One other aspect to this is if the key and CD have bben separated and you don't know which goes with which the individual disks do not matter. The key goes with the type of disk. OEM and retail keys are NOT interchangable.
If the OEM CD is one that came with a computer that had WinXP pre-installed then that key (license) is tied to the computer it came pre-installed on. You are not allowed to reuse or sell it and it most likely wouldn't work on a different computer anyway.
If the OEM versions are not "branded" OEM then there are more options available. This post is getting too long to explain further.