Can you help me to Overclock my intel Core 2 Duo E7500?

You probably shouldn't because the Intel Core 2 Duo E7500 gets hot really easily and it's at the End of Interactive Support (it says that on the intel website)

So maybe just buy/make a new PC because now there are SSDs and the k series processers and the z170 motherboard so unless you play csgo all day get a new one