100% cpu usage

[itsaj]

Hey everyone. I recently built my own computer and i am very knew to this but lately i have been getting really bad lag while playing games and i cant open anything while playing or it's even worse. It constantly says 100% cpu usage and i have ran smartclose and everything. I tried going to msconfig then going to boot, advanced options, and changing the number of processors but it only says 1. I have and i5 3570k. Please help me to fix this

 

[correon]

Open Taskbar and look the 4 tab to see the numbers of cores you have - it should read 4 .

 

[Brett928S2]

Virus ?

 

[darth pravus]

Open taskmanager and click the processes tab.

What is using the most cpu?

 

[BadTrip]

I agree with Brett. Could be Root-kit/Boot-kit.

I would run TDSSKiller.

http://support.kaspersky.com/5350

Then Microsoft Safety Scanner.

http://www.microsoft.com/security/scanner/en-us/default.aspx

Then Malwarebytes.

http://www.malwarebytes.org/