Upgrade memory and CPU help

[simpleoldman]

hi my friend gave me a old PC and i want to upgrade my old PC
can anyone give me a right item to buy?

can my PC support 8gb of RAM?
can my motherboard support Quad Core CPU?
what CPU is right for my Motherboard
motherboard socket LGA 775

this is my HP PC specifications
http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?sp4ts.oid=4162263&spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-c02453497-18%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken

please reply what exact CPU and RAM im gonna buy
i know how to put RAM and CPU but i dont know how many MHz, what CPU socket and how many GB (MAX) can my motherboard support.
my OS is Windows 64-bit Operating System. Windows 7 Ultimate

i want to replace my old 2GB RAM and my Pentium(R) Dual-Core CPU E66000 @ 3.06GHz 3.07GHz to Quad Core CPU

sorry for my bad English

Thanks, God Bless

 

[C12Friedman]

The Intel Core 2 Quad Q9650 is the best CPU supported by your motherboard. Your motherboard will accept (and run) up to 4GB of DDR3 ram at 1333MHz. Something like this kit http://www.patriotmemory.com/product/detail.jsp?prodline=3&catid=34&prodgroupid=77&id=691&type=1