Windows 7 is already as light as an OS can get, as beta testers who tried Vliting it found out. It can be Vlited for size (netbook) only, as all services not needed are set to Manual anyway.
Since you're already focused on the bloatware which corrupts any factory install, have a look at some tips on getting a perfect clean reinstall based on hundreds I've done:
re-install windows 7
Until then, here is the safest way to clean up the bloatware:
HP laptop has used up all four primary partitions