So slow

My computer is acting bad today. Its too slow. I can't easily access the website that i would like to go to. I don't know if its got something to do with the computer updates running or maybe a virus. I had anti-virus installed with it which i'm pretty sure not a reason though. Hubby's computer is also working fine so there is no way a problem for our internet connection. I maybe run a disk defragment here in a couple of minutes, clean the disk or anything that make it possible to work well. I haven't done it for a couple of weeks and that's probably the reason.