and I must add also, it was not necessary to supply a driver for scsi card or any other thing for install..
Just because the OS provides a default driver, it doesn't automatically follow that it is the best one for the job.
you may be right KillerWatt..But havent seen any component working slower , may be later I will catch..
My old SB Live didn't work any slower when it first encountered the XP driver, the only problem was that half the features didn't work properly until the SB driver was installed.
And in true creative style, features knobbled with subsequent driver 'enhancements' 
Yes, I agree though, put on the correct drivers. Most devices don't have Win7 drivers, though normally Vista ones work. The MS ones aren't bad as a starting point, as they are the HCL approved ones submitted about 18 months ago in most cases. Tends to be vga drivers that are updated very regularly
I was led to believe this is because Win 7 is actually win 6.x, a completely re-worked Vista :-/ :-/ Basically because of the problems they had with the release of Vista, they didn't want to go through it again
Win7 is, confusingly, Windows 6.1. So, yes, a (significantly) improved/tweaked Vista.
XP (Windows 5.1) was really a tweaked (and bodged in places) Windows 2000 (Windows 5.0), and was flawed in a number of ways, and suffered due to poor quality drivers.
Microsoft had to go through the pain of some significant changes with Vista, and at the same time implemented more thoroughly that previously a signed driver policy (driver has to be certified) in an effort to improve the crap splatted out by cheap chinese hardware manufacturers.
If software obeyed the long stated Windows programming rules, for the most part they worked fine under Vista (some architectural changes needed in drivers though). That software that didn't obey the rules often didn't run so well. Vista was in Beta for long enough for developers to fix issues, but many didn't bother. And the inevitable happened, and everyone said it was all Microsoft's fault.