The folder C:\Program Files\Comodo uses 449 MB (471 441 705 bytes) is this normal?
Most of this space is used by this folder:
C:\Program Files\Comodo\COMODO Internet Security\Rapair (298 MB)
My system disk is rather small, I only have 500Mb left on it.
On my system C:\Program Files\COMODO\COMODO Internet Security is 280 MB total.
You may have some other programs installed in C:\Program Files\Comodo
What OS are you using?
That is way much indeed. I recently clean installed 3.12 and I have 166 MB in total and 20.7 MB for the repair folder. It looks like you probably have several versions of the back up files. You could consider erasing the older versions and keep the latest.
In case you want to consider a clean install keep this clean up tool in the back of your head.
ok thank you, I’ll probably try a clean install 
Mine is 271mb with 119 in the repair folder. There is a bases.cav file in repair that is 102mb by itself and dated 9/17/2009. I did not do a clean install I just updated from 3.11. I suppose I could delete that bases file?
I’ve cleaned my log files, the firewall log was taking 250Mb and there was a double in the repair folder. now Comodo takes 273Mb in “program files”
C:\Program Files\Comodo\COMODO Internet Security\ occupies 68.41 Mb here.
C:\Program Files\Comodo\COMODO Internet Security\repair\ - 21.20 Mb.
Probably because AV is not installed.