Thanks b0uncer...
well to make the partition hidden I changed the id of that partition using fdisk (changed it into Hidden FAT, I dont recall that number right now). It was hidden after then i.e. was not shown by windows. But when I tried to access that HP'quick play thing, it simply booted into windows.
as second point you made, yea I installed GRUB as a boot loader and another thing you said that it overwrote that HP thing...probably you are right. That HP thing has something to do with boot loader (I read it on internet only, if you have got some time please have a look at this link
http://www.goodells.net/dellrestore/mediadirect.htm)
yea i cud see the contents of that partition when it became visible, it looked like an installation of windows and when I access that quick play function, windows actually boots up but at the end only "that HP player thing" runs. it intimates as we boot windows from a hibernated session.
now can you give little details about "configuring GRUB correctly for that partition" and also how to use windows boot loader for linux ?
Thanks
Sidhu