hotfixes are typically windows security updates, so if you were to remove them i would think that if you have automaic updates enabled that they will automatically get reinstalled anyway, and if you don't have auto update turned on then you will get the option to reinstall them if and when you visit windows update. If your computer is running slow check task manager to see how many processes you have running in the background. If there are a lot then you probably have a lot of bloat ware on your pc. Around 40 is typically ok, anything abouve that is a bit excessive.