Get an activation code for MS Office for £3-4 on ebay. All of these free alternatives are average at best
WPS Office Freeware. Ideal MS Office Clone. I have been using it since few years. Also known as KingSoft Office. No difference in functionality and interface compared to MS Office. (Excluding the hardly used or never used bloat functions of MSO)
Libre Office works well for me.
Is it fully compatible with ms office documents? I've tried OpenOffice and it isn't.