Asslam o alaikum

Mere pas p4 computer ha
Ma us ki cleaning kr raha tha.
Jis k doran mai ne processor ki cleaning krty wqt
Us k uper se silver color ka paste laga hua tha jis ko
Ma ne saff kr diya.ab computer ka processor bohat heat hi jata ha
Aur 1 gb ki ram lagata hun to system restart ho jata ha
Plz koi solution bata day.
Thanks in advance