Before buying a new laptop (see your other post) I'd use the system recovery offered by Sony to go back to factory conditions. Then it's as fast as it was when you bought it and (apart from hardware issues) the webcam will work also again.

By the way, you do realise, I hope, that external drives are rather unreliable. So - unless you have a good backup - you have a good chance of losing all pictures you store on it (I don't dare to use the word 'save'). Storing data (like pictures) on your hard drive doesn't slow down the laptop, so using an external drive as storage only is needed if your internal hard disk is too small (and then you need a second external as backup). And even then a bigger internal hard disk is much cheaper than a new laptop.

Kees