OCZ Ram Problems.. Please Help!

Hey everyone, up until just recently I was running on 2 gigs of ddr2 1066 RAM with zero problems whatsoever. The ram is a dual channel kit from OCZ. I had a little extra money so I decided to buy the same kit again, making it 4 gigs dual channel. After installing that, I get an APPCRASH error when I try to play games and just now got a BSOD. I am pretty much positive that it is the RAM I installed, because I have never had any problems before. I am running on Windows Vista 32 bit. Is it possible that my power supply just isn't good enough to power the extra ram? I really would like to get this to work, but dont know what to do! Any and all help is appreciated.

Motherboard - ECS Elitegroup NFORCE9-A

Processor - AMD Athlon X2 7750 @ 2.7ghz(stock)

Video Card - ATI Radeon 4830 512mb

RAM - 4gb DDR2 1066 Dual Channel Sli-Ready from OCZ - http://www.ocztechnology.com/produ [...] al_channel

PSU - http://www.newegg.com/Product/Prod [...] 6817709010

Wow, Might I just compliment you on your speedy response and accurate information! Thank you very much! The Ram was set to 1.9v I got it set to 2.23v So that's all said and done with. The Speed was set correctly from before. And I haven't got the slightest idea on how to adjust the timings in my BIOS. I found where you do it, but when I go from auto to manual there is around 16 options that pop up in front of me. I know the meaning of none of them!