I messed thermal paste and how to monitor CPU on a Windows XP?

I messed thermal paste between CPU and heat sink. I removed it and a good potion of it passed to my palm. Now what are my options? Is it safe to plug it in anyway and use it cause there is still remnants on the cpu and heat sink?

AND in a dire position to know how to monitor CPU on a Windows XP. what is a good way to measure it?