My desktop has been running slow (like turtle slow). How can I speed it up (cheaply, plz.)
What Iffy said is a good start, if you're still having trouble, try updating your drivers. Sometimes when they are out of date little bits of code can slow down your computer when it can't make things work correctly. Also, the manufacturers might have faster software for you to use for your computer. To make sure you detect and fix them, try a program like Driver Boost, I used it to fix my earphones.
Delete as many unwanted files as you can, compress your files, and do a computer clean up. Search for viruses too.