I have always used and programmed some type of computer as a student, engineer, and last gig teaching it (civil). But only since retiring these last few years have I begun to pay attention to the machine’s software maintenance – I have learned a lot right on this forum.
We have an ’06/7 gateway laptop that was very cheap then - $550 – like the OP’s Dell (which is my vote). The laptop was always quirky w/ McAffee, MS Medis Cemter’s tentacles, and too little memory (512). From '04, also hane what was then a good midlevel HP desktop system - $900. It too had issues w/ low memory and some software clashes as we learned wi-fi.
When we worked, IT people took care of work issues, and also sometimes advised on home problems (not much).
Both these machines are running faster and flawlessly like they never did – and both are XP. Adding a another 512k memory in each machine ($30 ea.), Removing all unused programs, clearing un-needed programs from the startup, cleaning and defragging HD, and using the free MS Security Essentials.
I have become attached to them. Plan to keep w/ XP as long as I can. I have some linux distros that really zip on them, and that is running from the CD/DVD!
About the OP and Dell. If you do not wish to ‘meld w/ your PC’ as I described, "dude, get a Dell."
Martha has been using a $280 Dell w/ W8 for many months w/ no problems. I like that machine too - I don’t mess w/ it as Martha has watched me fix many issues in the past and applies this and her work experiences, plus it pretty much self-maintains.