Vista was the installed OS on my work laptop - seems ok to me. For Windows.
I had Windows ME installed on one of my PCs at one point and never noticed any excessive
problems with crashes contrary to popular (read as "forum") based opinion.
Microsoft sell operating systems, Apple sell mp3 players er phones hmm computers where the OS
is not actually meant to used on non Apple equipment so it's not their bread and butter.
Apples latest variant aka Snow Leopard seems to have caused fun and games for a whole
load of users used to "it just works" thinking

Not forgetting the latest iPhones problems
with preset Alarms, Daylight saving and Year changes
Note that Windows 7 comes with a Windows XP emulator but only in the more expensive versions
as their line of thinking is that legacy support is a minority requirement that you should be prepared to
pay for e.g IR support. Hency full XP emulation is only available in the Pro versions.
If the laptop came with an XP cd then odds on it's OEM and won't like a different platform plus will lack sata drivers and won't see the harddrive after installation so will require playing around with nlite just to create a cd with the relevant drivers. Then there is the possibility that there are no xp drivers for some of the hardware.
A USB IR dongle is still IR and home premium would still not support it.
Vista was an attempt to maintain market share by releasing a new product. It was meant to include a new filing system (WinFS) which was dropped and didn't make it to Windows 7 either. Mind you theres all those folk trying to format terrabyte drives to FAT32 because the PS3 doesn't recognise NTFS
