Does my motherboard support dual-core processors?

"Your processor socket supports Core 2 Duo

LGA 775 for Intel® Core™ 2 Duo /
Pentium® D / Pentium® 4 / Celeron® D
processors

Edit: However make sure it's a Conroe version, but you don't have to pick a Pentium or buy a new motherboard.

Here's an overview of LGA 775 compatible processors available on Newegg.com

Personally I would recommend the E8400, since it has a very good price quality ratio."