If your PC is having trouble, what do you usually do? Probably, if you are a PC expert, you can fix it of your own but if you’re not, you might need to call up an engineer or an old friend who is tech savvy. Well, the first one is expensive and the second one might cost you an hour of having to listen to his World of Warcraft raid stories! So, the only option left for you is to do it yourself and to do so I’d recommend you to go through these seven PC-diagnostic tips. 

“Symptom: Sluggish response time

Could be: A software problem.

The fix: Run a full antivirus scan to make sure you don't have any malicious software tripping up your computer.

If malware isn't the problem, get into your System Configuration utility and look at whether applications are continuously running in the background that don't have to be, such as an application you rarely use that's constantly looking for updates. Then uncheck it, freeing up resources.” – Computerworld.