EXPLORER.EXE's proverbial problems. Face it: when Windows first
boots, your system is relatively snappy (assuming, of course, that
you're not currently experiencing hardware or software contentions).
When (not if) your session starts to slow to a crawl, don't reach
for the reset button. Instead, do a three-finger salute (press CTRL+ALT+DEL),
select Explorer, then press the 'End Task' button. The "Are
you sure you want to exit windows?" dialog will pop up immediately;
hit the ESC key to cancel, then wait a few more seconds. Soon, a
box will pop up saying that "Explorer is not responding."
Hit the 'End task' button and your Desktop will refresh. Windows
may become more responsive at that point; you've done a pseudo reboot.