weird folder in c:/ called snapshots

this folder contains three files called layout - control and snapshot (the layout sometimes is missing but might appear)and the snapshot keeps getting bigger and bigger , i can only remove them with process explorer , they appear on the same pid as (4) ng volume snapshot1 and before that it used to appear on pid(2788) of security log - with the update 2233 it appeared at the same time as the browser and pc freeze ups and with update 2235 its getting larger faster and also appeared to complete from wher it stopped then dissapeard and after a couple of minutes started all over again - the snapshot file takes several attemps to be added to the chest and was also denying to be submitted to the virus labs (update2233) at some point i was able to sent it (i think) because its name was kept specified every time i was updating the definitions - is it a malware/trojan/virus? or does it belong to avast possibly :participate to avast community (which is off) and if it is shouldtnt there be two boxes? one for collecting information and one for sending?.

Nothing to worry, it belongs to Avast NG.