Get a new computer--not a Dell?

If someone else has these problems, I wouldn't know because there is an error when searching.  There is an error loading pages.  The pages freeze--the cursor doesn't work.  The pages freeze and the cursor does work.  Pages don't respond--around and around it goes to no where. Husband bought 3/11 but didn't turn it on until the software support was over.  They replaced the hard drive within a month of having it on.  Takes about five minutes for it to turn on--pages either don't load or freeze when they do load.  Problem in IE, chrome and firefox turned into a photo negative so I unstalled it.  Have talked to several Dell people on FB.  Last one wanted me to completely erase everything off the computer until the time it was new.  I tried to run the Dell diagnostics on it but they don't work either.  This is my third and LAST dell.  I'd rather own a throwaway one that worked ok for a year than have this . . .  So can someone tell me what to do?  I use this for work at home--before this computer, I could finish my day in four hours.  It now takes +8 and that is with me not finishing all of it.  Do they have lemon laws for computers?  Originally when I called tech support, all they wanted to do was sell me something not help.  What do you think?