The Acumen software design blog provides you with helpful articles about Computer Troubleshooting.

This web site provides a good overview.

How to Troubleshoot a Computer wikiHow

SOLVED: FoxIt Software Performance

FoxIt   Recent updates to this reader, as of Oct 5, 2015, are causing major performance issues. The problem is rather technical but the result is that if you happen to leave it up for a few hours your entire computer will slow to…