My computer has recently been restarting on occasion and the error comes up as sysdata error. I usually just assume that I was running too many programmes and the virtual memory had had enough, but a couple of times my computer has just switched off entirely not to be switched back on until left for a while, turned off at the socket, the back and then turned on. It does feel very hot and so it seems like a safety fuse has blown or something. I opened it up just now for a look and it was scarily dusty, one of the fans was disgustingly thick with dust and I tried to get the large chunks out. I was just wondering if this seems like a safe conclusion and what the best way would be to give the innards a dusting as I worry I may damage something just running a duster over what I can.