Getting Rid of Add On

1st one

How do I get rid of a Add On that is no longer required....It starts up every time I open excel..and I no longer use it

2nd one

How can I make excel run faster.......I have a racing file with 180,000 lines in from that 20,000 were non runners....so I selected them and pressed delete.....after 35 mins it still had not deleted them....it seems to run so very slow......Am I able to send more memory to it or something...just starting to get annoying that I have to wait ages for it to do every calculation

Thanx in advance to anyone who replies