lost recordings no tv guide i dont know what to do? thomson 250gb?

ive had my thomson freview recorder box for almost 2 years and it is rubbish every now and again i will turn it on and it will say that i do not have a working hardrive and just start flicking and wont work this happened every week sometimes more, then i turn it on the other day and ive lost all my recordings and the tv guide doesn't work so i cant record anything anymore its really crap!