There can be many a reason for this. The most probable reason is that your Chrome is conflicting with other apps, modules etc. Or you have installed buggy add-on and extension or toolbar on your chrome.
Here is how we find that:
Open Chrome and type "chrome://conflicts/" in the address bar without the quotes. Check if there is any conflict. Uninstall all the toolbars, remove all the extension (From here: chrome://chrome/extensions/)
If you find any conflict, fix that.
But if you are still facing the problem, install any system cleaning app like Ccleaner, check all the options, run the cleaner, clean all the files.
Restart your PC, and download a newer version of chrome, install it.