How can I update the System Drivers in my C:\Windows\SYSTEM32 Directory? [migrated]

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http://serverfault.com – I've been having trouble with random reboots for a long time and Microsoft sent me a list of drivers to update but I can't find any trustworthy looking links online and the vendors have not been responsive to my requests for drivers. Here is a list of the ones I need to update and my current version. I'm not entirely convinced these are all out of date or the root of my problem as Microsoft suggests: C:\WINDOWS\SYSTEM32\DRIVERS\MEGASAS.SYS 1/19/2009 16:39 (2.24:0.32) LSI Corporation MEGASAS RAID Controller Driver for Windows Vista/Server 2008 for x86 C:\WINDOWS\SYSTEM32\DRIVERS\ATI2MTAG.SYS (HowTos)