My notebook computer has a 2.4GHz P4 with 512MB memory and is running XP Pro. I have partitioned the 40 GB drive into a 18GB partition (C for the OS and a 20GB for everything else. About once a week, for no apparent reason it suddenly starts running dead slow because something!! is making the CPU run continuously at about 95%. Crtl-alt-del tells me only that the system is usuing around 95% of the CPU. Each time I repair or reinstall the OS. It happened again yesterday and I reformatted partition C. Now I have the system back up on C but the OS does not "see" the other partition. HoW can I activate this other partition? Any ideas on why I get these regular slow downs (15 minutes to laod OS and about 10 minutes to open Word. many thanks.