Laptop slowed down and works weird, why ?

[mondo90]

Hello, last week I've download few Gb stuff from internet which shrunk my HDD to 80 Gb free space and since that moment my laptop works weird. First of all if I try create new folder / file or even move something from one place to new I have to refresh desktop (or folder) to see it. Sometimes it works but mostly doesn't.
Next, my laptop reboots in about 5 min, generally system slows a little bit ;/

What I did to resolve problem:
- full system scan with norton found 2 viruses (completely deleted , done
- disk defragmentation, done

What is wrong ?

 

[Ztruker]

It's quite possible you still have remaining malware on your computer as Norton (or any othe AV software) will not find everything. Try some scans with other software.

Malware Bytes Anti Malware Free
Microsoft Windows Defender Offline Scanner

Try running CCLeaner, see if that helps.