My internet is so slow

I think I have written about this a while ago, but cannot find it. My internet is so slow. I have Windows 7. That little round circle keeps going around and around. I ran malwarebytes and had over 700 problems and fixed them and now it seems slower. I went to msconfig and only checked 2 startup items. I ran cCleaner and the registry. I looked at other people's post and tried what you told them, but it didn't seem to pertain to my problem and didn't help anyway. I have plenty of ram. Don't know where to find it, so can't tell you how much. The cable company checked my modem and said it was fine. I went to system restore to when it was faster and that didn't work.
Well, I think I covered it all, hopefully you can give me more ideas. I cannot do a clean install of windows because I tried that years ago and totally messed it up and had to have a tech come out and it didn't last anyway.
Thanks for any help you can give me.

Hello Patti:

Just a word of advice for the future, never delete files even temporary internet files , or the clean the registry if you even suspect you have malware viruses of any kind, it can actually make it more difficult to clean the infections fragments can become more easily hidden this way!!!