Hey guys, I have a HP laptop with processor ~ 2GHz and 3GB RAM. I recently upgraded to windows 7 ultimate from vista. The problem is, since my processor is core 2 duo and have suffecient RAM, I bought the 64 Bit OS version. The lappie has become horribly sluggish now and I feel this is because of 64 BIT OS. I am going to try a reformat. But can I install a 32 Bit OS now with the same key? I am in no mood to buy the key again.. If this doesn't work, I'll probably just go back to Vista. Please let me know if I can use the 64 Bit key to install the 32 BIT version.. Both being Ultimate versions. Thanks in advance.