Generally, to qualify for head of household filing status, you must have a qualifying child or a dependent. However, a custodial parent may be eligible to claim head of household filing status based on a child even if he or she released a claim to exemption for the child. See Noncustodial parent is claiming an exemption for my child; do I still qualify as head of household?
The cost of a personal computer is generally a personal expense that’s not deductible. However, you may be able to claim an American opportunity tax credit for the amount paid to buy a computer if you need a computer to attend your university. For more information, refer to Publication 970, Tax Benefits for Education.