Windows XP Computer Overall Slow, Freezing & Locking Up.

So, what do I need though? Which one between those two or three?

I know the name of it. HP. But the model.

Apparently, you already gave us the information on p. 2 of this thread:

HP Pavilion a720n Desktop PC

Here is a page that has the type of RAM your mom's computer needs (click on "Show all compatible computer memory"):

http://www.crucial.com/store/listparts.aspx?model=Pavilion%20a720n&Cat=RAM

At the very least, you should buy this stick:

http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=65B39C24A5CA7304

Then again, for only ten bucks more, you can get this one:

http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=3EE22E4DA5CA7304

I know the name of it. HP. But the model.

How do I know which computer my mom has? For the Crucial website?

You should be able to tell just by looking at it.

Also, when you run the Crucial tool from their page, it should tell you what the system is AND what kind of memory it needs.

The top seven processes are as follows: System Idle Process: 98 CPU. firefox.exe: 39 CPU. wuauclt.exe: 05 CPU. svchost.exe: 00 CPU. alg.exe: 00 CPU. Updates from HP: 00 CPU. hpqtra08.exe: 00 CPU. The top seven processes are as follows: System Idle Process: 16 K. firefox.exe: 34,832 K. svchost.exe: 80 K. alg.exe: 80 K. wuauclt.exe: 8,720 K. Updates from HP: 1,268 K. hpqtra08.exe: 1,024 K. And like I said, these all numbers and processes keep changing. I just got these before they just changed. I think it's the first ten minutes or so. My mom's computer.