As a bit of a follow up to a post made a few weeks ago, we had one of our laptops at work start to show the same symptoms that mine did previously and start to dramatically slow down if multiple apps were run and then just shut down for no apparent reason. This particular laptop still had a service agreement on it though so off we took it to PC world. They ran the normal AV, malware etc progs and found nothing. The geek at their "Tech Guys" bench did say from the off though "I bet it's overheating, bet the fan is filthy". 5 mins later he had whipped the keyboard off the HP laptop and showed me the fan and heatsink underneath and it was trully minging. Vac'd it out, put it back together and it now runs like a dream. Advice he gave to me was that once a month, with the laptop turned OFF, put a vac tube up against the cooling inlet and leave it there for a minute or so to reverse the fan and suck all of the shite out. Prior to the cleaning the processor was running at 104 deg C if Word, Excel, IE and WMP were running at the same time (that was the easy test he did), after the clean out it was running at 42 deg C and as you know, heat in a processor = loss of processing power. Just a bit of easy advice I thought I'd pass on as it makes a ridiculous difference, vac your laptop out once a month.