Hey there Jake welcome to Pchf

,
follow Microsoft's steps here
Optimize your computer for peak performance
it should speed up your Pc by quite alot,
also do some virus scan's with things like
AVG, Adaware etc,
also read this guide here
How to Speedup and Secure your PC - JohnTP.com
.
You could also use a reg cleaner but i've had bad experiance's with them so i'll let someone else reccomend one

.