Problems with my Compaq precario 2100

Alright, well I was using my laptop the other day just fine and then suddenlytoday it started having all sorts of problems. So I did a virus scan, but it starts up but it doesn’t seem to want to fully boot up every time and then some of the keys stick and the mouse gets stuck.
I removed the viruses but I really don’t know what to do, the laptop is old, but for these problems to come up so fast, is very frustrating, if anyone has any thought about what is wrong please let me know.