Not being funny, but I think making a 'pic of the inside of your house', is not wise, for all to see on a forum. Having done a number of telephone/cctv/television cable extentions around property, I found that it is rather simple.Just sit down,look at the possible routing, decide where you want your cable run, then go ahead and do it.If you are not into lifting floorboards etc,then go via skirting boards and carpet runs.
Should you decide to go the 'wireless' way, then a visit to a good computer shop (PCW perhaps) or email to someone like Belkin, should give you the necessary advice,prices etc. If you purchased your 'wireless' equipment from a retailer, and if they stated that it would work, on your property, and it doesn't, then you could claim a refund.Not sure if Argos, do a 16 day returns/refund on this type of unit!(;o).