Reading through your posts, I may have some ideas for you.
"My current PC laptop is old and on its last legs."
That usually means the software is more of a problem than the actual hardware. I know that you are not very good with computers, but if you have all the original CD's that came with your computer, its not too hard to just reinstall your OS. That will turn your computer back to the way it was when it was new. Windows OS gets slower and deteriorates with use over time. Doing a reinstall on an older computer makes a very big difference. I'm just guessing, but I would say 70-80% chance that will fix your problem. The cost would be 0.
Another simple and free option to try would be to download and run a light weight Linux distribution from a CD-R or a usb stick. Its very easy to do, and your time invested would be no more than an hour or so. You mentioned that your iphone works OK. Apple bases their OS's off software that's very similar in nature. If you're interested, just let me know and I'll tell you what to download and burn to a CD so you can try it.
If you end up needing a new PC, go to Best Buy's web site and look at the Asus Transformer Book T100TAF 10.1. Depending on options, the cost will be around $300-450. It runs a full version of Windows 8.1 and has a full size usb port. What's nice about this computer is that the screen comes off and it works like a regular 10 inch tablet. If you need it to be a PC for more functions, just plug it back into the base.