If no objection is raised to the use of the evidence, they can use it. But be careful in objecting - if you are stating that you have no owernship interest in your wife's computer you may lose any "standing" to object to its seizure. Also, you state that the warrant covers items to which you had access. That's much broader than use - you can have access to items you do not use.
If you wish to try to have evidence suppressed in a criminal prosecution, it's a good idea to get help from a lawyer.

