Svchost.exe PID 1068 (LocalSystemNetworkRestricted) High CPU usage

[ChrisCamm]

I've been experiencing this problem long time ago but it decided to solve it once for all.
I know that is a common problem, i've researched in may pages but with unsatisfactory results.

So the svchost is taking up to 50% of cpu usage from time to time
I scanned malwarebytes and everything is clear.

Could it be windows updater?
Because it does not happen everyday


More info:
These are the services that are running:

Pid 1068 of svchost.exe

wdusystehost
uxsms
trkwks
SYsmain (superfetch
Netman
AudioenpointBuilder
Pcasvc



(EDIT)

PC SPECS:

Win7 32-bits

Amd Athlon IIx2 3.00ghz
Ati Radeon HD 7700 series
Hdd SATA II
4gb Ram

All drivers updated, using malwarebytes and I've already done a full scan




Update:

 

[ChrisCamm]

I should add that it doesn't happen all the time.
And If if kill the process the cpu usage goes 3% again, which is totally normal

 

[ChrisCamm]

Please really need help with this, i can't solve by my own