After I do a clean on my Acer laptop. For several days after I get two dialogs boxes that say "cannot delete file or find source file" every time I start it up. Then in a week or so it clears up??

I have not heard of that specific problem.  Which clean in A1Click are you doing?  Clean PC should not do that.

I'm using A1 Click Ultra. It has been doing this ever since I bought the lap top a year ago. After doing a clean I get the two dialog boxes which I have to close before it will start. Then in about a week it starts normally.

The dialog boxes don't give any indication as to which files they are referring to.

   What are you clicking on in A1Click Ultra PC Cleaner?  Clean PC, Remove Tracks, Run Settings, Registry Cleaner, some thing else?
   It sounds like your computer is not allowing A1Click to delete a file.  You might watch where A1Click's scan is and maybe that would give you an indication of where the files are.

I'm just doing a clean.

Nothing during the clean seems out of the ordinary and the list at the end does not indicated anything.

Everything seems fine until the next time I try and strart it. Not a big deal because after a week it fixes itself.

   I assume that when you say, "until the next time that I try and start it", that you are talking about starting A1Click.  A1Click does delete the old undo files when it starts.  It sounds like your computer is not allowing those files to be deleted.

No. I meant the next time boot up my lap top I get the dialog boxes for a week.

   I don't know how that could be coming from A1Click.  Maybe something else is causing that.
   The only possibility that I can think of is if one of the startup items is located in the temporary directory or the files that it uses are located there.  I would suggest looking at your startup items and see which one could be causing that.