Home and Student 2010 problems

So I bought Microsoft Home and Student 2010 a year or 2 ago for my laptop. It was working fine up until I had to get my laptop repaired numerous times for hardware problems. I eventually got it repaired a month a go, I installed Office Home & Student (for 3 pc's and I'd only installed it once on my laptop) and it seemed to be working. However when I tried to get some work done and open documents I keep getting the message of it being an unlicensed product. I tried putting in the install disc again to try and repair features and see if that made a difference, it didn't. I went to Google and saw some suggestions like changing the settings because Publisher isn't a part of it so wan't working, I did that and it too made no difference. I saw other people saying to remove and re-install it and other people saying there is no need. I've also seen people saying you have to upgrade. I've already spent almost £200 on it, surely I don't need to upgrade again, do I? If anyone out there can possibly give me some hope of fixing this issue I will be very grateful.

Andy