Standard spinning computer hard drives (HDD) are quickly being replaced by the newer Solid State drives (SSD). While the HDD has high spinning platters like an LP record, the SSD has no moving parts, similar to a USB stick ... so there's far less heat, the worse enemy of electronics (aside from water) and no moving parts to breakdown. SSD's offer much faster performance and durability than standard HDD's and SSD prices are dropping fast! The slowest thing on your computer is the HDD. Other advantages of SSD's over HDD's are: lower failure rate, lower power use, significantly faster bootup time (10-30 secs vs. 30-40 secs), less noise, less vibration, faster file read/write speed (550 MB/s vs. 50 MB/s).
So rather than buy a new PC, replacing the HDD with a SSD will likely improve its speed drastically. For more information on SSD's and their advantages over HDD's, read here!
I love technology and how it enhances our lives! Just think, without the Apollo moon missions, we might not have calculators! Imagine!!