If you're experiecing lagging boot times ie hanging at windows logo screen on boot up it vey likely it could have something to do with the NVidia IDE drivers. If you check your event viewer and see nvide errors then roll the drivers back to the MS native for ide contoller.
DFI T2RS, Q9450@3.4, 2X1gig Ballistix, EVGA 460GTX
Gigabyte EP45-DS3L, Q6600@3.2Ghz, OCZ 6400 DDR2, EVGA 9850
ASUS P5K-E WiFi, Q6600@3.2ghz, 2X1gig Mushkin XP2 6400 DDR2, EVGA 260GTX
ASUS P5Q-Pro Turbo, Q9450@3.4Ghz, 2X1gig Mushkin HP 6400 DDR2 EVGA 9850
ASUS P5K Prem WiFi Q9450@3.4Ghz, 2X2gb OCZ DDR2 800, MSI 460GTX Cyclone
Gigabyte EP35-DS3R, Q6600 , 2X1gig Corsair XMS2 DDR2 800, EVGA 9800GT
ASUS P5K Prem WiFi Q9450@3.4Ghz 2X2gb OCZ DDR2 800, Asus 9850GTX
Gigabyte EP45-DS3R, Q6600@3.2Ghz, 2X1gb Corsair XMS 12-4-4-4, BFG9850GTX
Gigabyte EP45-DS3L, Q9450@3.4, 2X1gb Corsair XMS 12-4-4-4, BFG9850GTX