100% disk usage
Run your malware program or get malwarebytes to see If you have no niggly viruses as Anti-virus software like Norton does not pick everything up.
I tried everything when I got 100% disk usage.
It all started with the latest Windows updates.
I also found that the old Ik multimedia synths would not run In Sonar and deleted them
I hate Sampletank and all that they stand for as that company causes nothing but rubbish.
Except Syntronic which works Hurray!!
After i got rid of Miraslav ,Sonic synth, and Sample Tron all worked as It should.
I think older out of date synths are causing a lot of the problems.
I have Arturia and the Korg collection with FM8 and all was running smooth until my computer packed this week.
I am going to make sure I get a top notch computer now with lots of ram.
Disabling things in services does not work.
all the best
John