First advice is ignore Geek Squad... they work for
Best Buy and have an incentive to push you toward buying a new computer rather than keeping the one you have... they are also grossly over price for what they do.
My first question is what do you mean lost RAM memory... you can't lose RAM memory unless someone opens the computer and removes it. IT is possible that you have some faulty memory (but that isn't likely)... or it is possible that your computer has been set up to use virtual memory on your hard drive and because of lack of hard drive space the amount of memory you are able to use is being lowered by the computer... at any rate if you computer will boot up and it runs the programs you need or want to run there really is no reason to get another computer if you are trying to save money.
Most computers can be easily upgraded with more RAM memory or a larger hard drive and doing either or both will often make you feel like you have a newer faster computer than you were used to because of the improvement more memory or a larger hard drive can make.
Also you are using an HP laptop, and HP laptops are probably one of the easiest ones to make changes to the RAM or Hard drive that I have ever worked on... I've done both changes to my wive's HP and doing both things took less than 5 minutes to install.... the only thing that was a pain was re installing the operating system and software which takes the time waiting for it to happen but is still not a big deal.
If you can tell me the exact model number of the HP (found on the bottom)... and then give me a bit of information from the system I can tell you if there is really any need to ditch your computer or if you could make a improvement in some add ons...
To get the system information click on the control panel, then click on system and look at the information on the lower right side of the box that pops up... what is the CPU it list and speed... and how much memory does it say you have...
Let me know what that information is.