I accidently clicked on some program the other day which downloaded a program or programs to my laptop, I have removed all programs which were downloaded on that particular day but my laptop is still running very slow and my google chrome page has pictures on it, like apps of the websites i use most often which it didnt have before...
The google chrome page sounds normal tbh, I think you may have bee4n running an older version
As for the running slow, are you absolutely certain you've removed everything? If you open windows explorer (click my computer) then do a search for the programme you downloaded, see if it brings anything up
If you have Windows, try Start-->Control Panel---->System and Security---->Action Centre---->Restore System to an Earlier time. Then look at the options there. The above is for Windows 7, but they are variations on a theme. Best of luck