Sorry if this doesn’t solve the problem but I hate to see 0 responses to a post).
Search the internet for illegal handle and all you get are software developer’s web-sites like
(But not allot of people who have reported errors like yours).
Check device manager to see if everything is working ok. You could disable software from loading on start (see if the message disappears). You could do a system restore to before the error appeared. Run system file checker or even repair windows from your c.d (depends on your operating system but you don’t say).
If all else fails post your question in Helproom (they are a brainier lot over there and questions such as this seem to get a better response).