Windows Update SP 3
If you don't want to install all of SP3 you may notice that under to SP3 download update link is the option to only download the security updates you are missing.
Lion 10.7.4 (11E53) on a MacBook Pro
Processor 2.4 GHz Intel Core 2 Duo
Memory 2 GB 667 MHz DDR2 SDRAM
Snow Leopard 10.6.8 on a Mac MINI
Memory 2GB 667 mHz DDR2 SDRAM, 2GHZ Intel Core 2 Duo, L2 Cache 4mb. No Partition