iclone is a resource heavy software.... try disabling any TSR's starting with your computer that you don't need or may be impeding iclone, especially if you have a laptop which usually tend to have extra bells and whistles to control special laptop features.
and just for reference, a tsr, is a "terminate and stay resident" software, these are the programs that start with your pc and continue running discreetly... ie your anti-virus.
Now I'm not saying disable your anti virus, but there's a ton of other things that start up by default in computers that eat up your ram and are not necessary, that have to be removed manually with the msconfig command - click the start button, type msconfig in the search bar, click it when it pops up, click the tab that says "start up" and look at the list of software that starts with your computer - disable what you don't need / use.
This may or may not be your issue, but I know that when iclone has to compete for resources, you will get the kind of behavior you just described.
Post again if this doesn't fix it, - whatever the case may be, this error sounds like iclone competing for resources with something else, Or your video card may not be fast enough - if it is within spec, then make sure you have the latest video card drivers.