Hi Firecow,
to find out how much space is being used by your system, the fastest way is to double click on the 'My Computer' Icon found on the desktop.
If you
cannot it on the desktop, right click on an empty part of the Desktop, select Properties, then click on the Desktop tab, and finally click on the 'Customize Desktop..." button.
Make sure that 'My Computer' is checked.. then click ok.
Once you double-click on
My Computer Icon, you'll see Windows Explorer. It will show you all the Hard disks available to you on your computer, with the space taken by each. This space is the amount of data used on your computer.
Now to be sure that you scan all the files on your computer, start AVast by right click on its 'A' icon on the task bar, then select the second option from the top called 'Started Avast! Antivirus'. Once it has completed it's memory scan, you will have the option to scan all the local hard drives on your computer (this is what you want if you want to scan the entire computer).
To select that option, click the first big button (Local Disks) located on the upper right of the default skin (looks like a media player) just below the '?' '-' 'x' tiny buttons.
If you're like me and are using the szc-kde skin, just click on the big button that looks like a hard disk at the bottom (4th button from the left).
Once clicked, you just need to click on the play button to start the scan of your entire computer. If you need help choosing the 'type' of scan, let me know (there's a quick scan, normal scan and thourough scan) all with the option of scanning the archived files (.zip, .rar etc).
Good luck and if you do scan, let us know how much time it took this time
Regards,
_Rej_
P.S. the above instructions assume that you are using WinXP. If you're using Vista, they are similar. Again, let me know if you are having trouble if you're using Vista.