guys pls help is my drive dying?

Disk 0 (C:) Active time 100%
Not responding
thats my laptop after waking from sleep... it used to be fine, now it constantly crawls and i sometimes hear teh drive clicking softly, i have important documents on it... should i be worried, or is this a Windows thing? im gonna copy my documents to a USB stick tonight just in case... but Id love to know whether this is a dying drive or just Windows being heavy.