I am trying to update my system from 10.6.1 to 10.6.2. I downloaded both combo and not combo. When i try to install it it says this system does not meet the requirements. When i try to update it on software updater it, the update 10.6.2 doesn't even show up. Does it have something to do with partitioning my hard drive with MBR?

Specs
HP Pavilion A6109n
nForce 430 motherboard
AMD Athlon 2x 3000+ 2.0ghz
8600gt 512mb
2 gigs ram
320 gb hard drive
10.6.1 GUID journaled MBR!
Win7 Pro