Possible malware slowing my PC?

[AnotherSloth]

I built my PC a year ago with no problems. My free Antivirus virus, avast wore out a day before I had my problem. Anyways I was using my computer, attempting to load CSGO and all of sudden everything went to a crawl, when I pulled up control, alt, del it said my "disk was at 99% usage" then a pop-up window said windoes had stopped working, so I shut my computer down. When it finally loaded back up it said it was Defraging my computer. I can log into Windows but every thing loads for about 5 minutes before it does anything. The computer is so slow it's un usable, I finally got it to reactivate my Antivirus but I can get past that. What should I do?

 

[Chugalug_]

Download Super Anti Spyware, one of the best anti-viruses for getting rid of rootkits etc. that other programs don't pick up.
Also install Malwarebytes Anti-virus for general use.

 

[AnotherSloth]

@chugalug_ Everytime i attempt to open Chrome or almost any application it gives me a gray screen.

 

[Hlsgsz]

How much free space do you have on your system drive?

 

[Chugalug_]

^ If your HDD or boot drive is full it can cause significant system slowdown.

 

[AnotherSloth]

@chugalug_ How do I check these things?

@Hlsgsz I don't know, How do I check? My hard drive has 60% remaining

 

[Hlsgsz]

@chugalug_ How do I check these things?

@Hlsgsz I don't know, How do I check? My hard drive has 60% remaining

If it has 60% free space, that's not it.

Run crystaldiskinfo and post a picture of the results.

 

[AnotherSloth]

@Hlsgsz I'm attempting to get chrome to work, I'll try to get it done in the next 30 or so. Everything keeps crashing.

 

[AnotherSloth]

@hlsgsz It won't let me run it.

 

[Chugalug_]

download it onto a USB via another device and run from the USB as an EXE.

 

[Tradesman1]

Can you boot to safe mode?