Older P4 Centrino laptop with XP Pro. Always been fairly reliable. However, it recently started behaving poorly: Windows will slow down to the point of almost locking up, applications slow down and crash, etc. I reinstalled XP from scratch and it "fixed" the problem for about two months...now the problem is back.
I ran memtest, prime95, the Fujitsu hard drive tool (forget the name), and SpinRite. Everything checked out fine independently. (I ran memtest specifically for many hours)
Is the laptop just getting old? With the high level of integration in a laptop, my gut tells me that something is physically wrong with the board or chassis, and it will continue to worsen until it fails completely.
However, I'm willing to hear any troubleshooting tips you may have for laptops that start behaving poorly. I have no spare laptop parts.