Losing C drive space daily

I'm about a year into windows 8,which came pre installed on a Lenovo C440
64 bit, 1 terrabite HD partitioned into C,467 GB,E,storage 437 GB
I updated to 8.1 a few weeks ago and aside from the 'feeling' that everything is running a bit slow
all else seems fine
except: ever since i got 8 I've been losing space on C drive,about a GB or 2 a week
somewhere I got advice to go to System,delete all restore points and then create a new restore point
I'd do this whenever I'd be down 4/5 gigs and get all the lost space back

since I went to 8.1 I'm losing a gig or more a day, and it doesn't come back after the delete restore process
I use CC cleaner daily and remove everything but cookies ( way too much trouble to have to log in again at every site I go to)
I don't hibernate,just sleep
I auto defrag once a week
I have Trend Micro do a full scan nightly
I still have plenty of space but it's driving me nuts that I've lost about 9 GB in 3 weeks of 8.1
Any advice is welcomed and thanked in advance

edit: I have searched many threads here and can find nothing similar

download treesize free and run it. It will show you where your space is being used.

pparks1 said:

download treesize free and run it. It will show you where your space is being used.

Click to expand...

i tried it,and manually added up everything and the numbers matched
still having more than 400GB free i just decided to stop worrying about it
i found that once it shrunk to a certain size,it stopped,and the point it stopped at was the exact same size before i went to 8.1
when i went to 8.1 i somehow gained about 9GB and figured 8.1 was just smaller

i'm guessing the issue is something related to 8/8.1 and since the shrinkage stopped i'm just letting it go

thanks

Were you cleaning out System restore points too ? It can be set to certain size and will not cross it. It deletes oldest points on the "First in, First out" (FiFo) principle. Like that, it "fills up" disk to certain size and than stops there.

"Were you cleaning out System restore points too ? "

yes ,whenever it got about 5 GB smaller and then i'd get that back
i think i slid the size bar over for a smaller amount and the drop off was only 1GB per week/10 days

when i first went to 8.1 my C drive was 425GB,after the upgrade it was 434.
it's now steady at 429 and when it gets to 428 i delete old points,create a new one and it's back to 429
been that way for over a week so i guess whatever the issue was got resolved

thanks