Yep, because is not possible to install 10.7.3 retail/updater over Snow Leopard to the lion partition, but with iAtkos is possible.

Also, I've installed the 10.7.3 update and the nvidia drivers, booting without the graphicsenabler, and is still happening.

I will try to remove some nvidia kexts that are not belonging to my vga model

PD: Looks like Snow Leopard is making some kernel/kext caches in the Lion partition.

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System

• MoBo: MSI K9N2GM-FD, Chipset GeForce 8200 (MCP78)
• CPU: AMD Athlon 64 X2 5200+ @3,02 Ghz
• RAM: Kingston 2GB DDR2 800Mhz + Corsair 2GB DDR2 800Mhz @747Mhz
• VGA: EVGA 9800GT SSC
• HDD: 300GB WD SATAII
• Optical Drive: Sony SATA 24X
• OS: Vanilla Mac OS X Server 10.6.0 + Nawcom ModCD, upgraded to 10.6.8 and Windows 7 x64.

Everything works, except sleep, so system isn't Energy Star compilant .