I have an Advent desktop which is a few years old now running XP and Chrome. Internet access is fibre. For some time now I have had a problem with very high hard disk activity when connected to the internet which completely stops all use of the internet until the disk access stops. This happens every day at no particular time and the hard disk light can be on virtually non stop for up to 5 minutes and sometimes longer. This evening it has been on and off for almost three hours and simply trying to enter a login and password to an internet site can take half an hour......and then I get timed out. However, now there is virtually no disk activity whatsoever and I can write this. I have Avast on the computer and have an ISP firewall and filter switched on. Does this sound like an invasion of some sort or is it Xp doing something daft. Is there any way of looking at a log to see whats going on during the demented disk access? Any suggestions apart from buy a new computer would be appreciated. 