Sorry but the arial serif text is mangling your post but what CPUs work in that machine may be found in prior discussions like I see at a link to follow.
<span style="color: rgb(7, 15, 20); font-family: Verdana, Tahoma, 'Nimbus Sans L', arial, sans-serif; font-size: 12px; background-color: rgb(243, 244, 246);">I'm not sure what it is that I need to upgrade my Dell Dimension 5150 desktops and I could use some advice. According to the software company (DVMAX Veterinary Software) I need to have an Intel Dual-Core 2.0 Ghz or higher processor, currently they have Intel Pentium 4 3.2Ghz. I just need to know what type of processor I can buy that would fit their requirements and work with my computers. If anyone has any suggestions it would be greatly appreciated. Thank you all so very much for helping this less than tech savvy girl.