Services.exe cpu spiking on XP?

my computer has been running slow lately, and it turns out that about every 5 seconds, services.exe spikes up to 100% cpu. this usually takes about an hour to happen after i restart my computer. also, my PF usage is steadily going up about 100mb/hour. I've looked all over the internet for solutions, but the only ones i found were for windows 2000. I'm not sure what happened, but it makes it frustrating to use my computer.