Its not advisable to install Apple's updates unless told otherwise (by the gurus). The updates, more often than not, will break our systems - particularly AMD based ones.

My advice, reinstall Leopard and take the time to research what you can and cannot do.

The 10.5.2 update will most likely require a PPF patch for the original ISO. However, the will probably be other methods - just not through 'Software Update' ;-)

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MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB