Weird problem

I have just found a new thing on windows 7: everytime I go idle for lets say at least 10mins(where the power saving mechanism kicks in), and after a couple of mins after that, my pc led light thingy flashes quickly as if it were processing something. Then after I came back, to my surprise, my drive c space got occupied a little. From 94GB to 93.5. I don't know why this happens, is this a windows 7 thing? I scanned with avira and mbam and found nothing. So should I be worried? Can someone explain this?

EDIT:

So I just also noticed that after one week, the space gets back, but when I go idle again, it eats it up again. So someone care to explain what this is? Is this windows 7 innate?

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I've found the answer from the seven forums. It's only restore points and shadow copies. Anyway, I dont use system restore at all, can I disable this or just enable it? It takes 10% of hdd space, which much for me.@.@

You can disable it, but be prepared to reinstall when and if something goes wrong. I hope you have all your installation media for any programs that you may lose, and I hope you have backups of all your important files and documents.

^

Well I remembered in xp, my cpu technician disabled restore points. I only have a very little disk space since I bought my pc 2 years ago. Anyway, so you mean to say its ok as long as I have backed up my important files?

Can you perform the Speccy suggestion?

Im still a newbie on the pc, so I don't want to tweak settings, I will have to wait for my brother to come home(since he's the pc guy). Anyway, so its really ok to disable it as long as I have my important files backed up?

Yes it is, and that program is not a tweaking program it will allow us to see your specifications/computer components so we can tell you what could possibly be updated.