you mean install SP1 on a freshly installed Vista???
if yes, then that means i've to first run a full recovery (re-installing vista) on laptop , then install SP1 (standalone installer)?
& i'll have to move[burn] 40+ GB of data onto dvd.
I meant installing from a Windows Vista SP1 DVD directly. But if it is not possible then installing SP1 on a fresh installation of Windows Vista RTM really helps, but it is time consuming as well.
In your case just make another partition for the data and move 40+ GB data into it temporarily or use a external HDD if u have one. After the whole installation procedure finishes, restore the data to their rightful places and delete the temp partition.
btw, if i uninstall SP1, will i face more problems?
I dont think so. In case of the laptop, as long as you have the recovery partition intact you dont need to worry.
FYI I Installed SP1 on the top of my Vista installation after using it for some months and found the system sluggish than ever. So I formatted the Vista partition altogether and install Windows Vista SP1 directly from DVD (not installing Vista RTM first and then installing SP1 on top of it). I found the system more responsive and usable after that and happily using it from last April without any hiccups.