Illustrator CS5 – Error loading plugins

I got a problem with Adobe Illustrator CS5. After downloading of a regular adobe updates, Illustrator started to misbehave while launching login window. All the days i was running a trial version and it worked fine for me. Then i decided to reinstall Illustrator, downloaded it from the official site, and installed it at last. Now the program opens and while opening it displays a message Error loading plugins. AISaveForWeb.aip DxfDwg.aip PNGFileFormat.aip and crashes after the first save. Why this happening and how to fix?