Yesterday, XP loaded into the desktop within a few seconds, and it's been doing that consistently for as long as I can remember. However, today it struggled on the splash screen for at least a few minutes from a cold boot. The loading animation--that blue bar--usually only makes between one to two passes. But on this particular incident the splash screen animation persisted for a few minutes and took a few more minutes to load the desktop. I made a few more attempts at recreating this incident but to no avail, the system would reboot or cold boot to the desktop within a few seconds as usual, after this one time incident.
Could this be a symptom of anything? Keep in mind I haven't installed anything new for at least a few weeks. In addition, NOD32, Rootkitrevealer, and spybot couldn't find any problems.