Satin Ruby

My computer works fine (except when sl throws me out lol) but the past few days I have received an inworld, on screen message saying that there was insufficient memory for textures - why and what does that mean. Scanned, emptied cache etc and still the message appears

I am trying to log on to SL and I am told that I "cannot access second life from this computer". I haven't done anything wrong and I haven't received anything from LL. Can anyone please help me. There is someone else who uses secondlife that lives here but they use their own computer but it is the same internet connection. They can get on their account though.