Vista locks up after ~10h. of activity

I am experiencing a problem: Windows Vista completely freezes/locks up lately... It happened today twice - the mouse and keyboard stopped responding and I had to re-boot.

I checked the Application Events Log and I see these two errors: Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected.

and then

The following boot-start or system-start driver(s) failed to load: SASDIFSV SASKUTIL

I checked Help online and it points to http://technet.microsoft.com/en-us/library/cc756390%28WS.10%29.aspx and suggests Updating the drivers.

I'm not sure why would I have problem with drivers and if so, how can I find out which drivers to update?

Can you please help me?

I used instructions from http://windowsitpro.com/article/articleid/45480/q-how-can-i-uninstall-the-microsoft-systems-management-server-sms-2003-advanced-client.html - the time will tell if it will help with the problem