Haven't had to use your services since around 2012, thankfully, but seem to have picked up something I can't shake thru conventional (for me) methods.
Symptoms : the laptop runs normally for the first 5 mins from startup, then suddenly each access to File Manager, or any page on the internet through Chrome, takes 10-15 times as long as normal. The hard disc seems to be running (flickering light) almost all the time, whether a page is being requested or not. Task Manager shows the CPU at around 64%, pretty much steadily, while idle.
Hardware : Compaq Presario CQ 81 laptop, running Windows 7.
History : no previous infections since 2012, when I installed Malwarebytes' Anti-Malware and rid everything that infected the same hardware being used now. The Anti-Malware has been resident since then, showing no infections, until last week.
I have not downloaded and run any new programs in the last 2 weeks.
The hard drive is only 50% full, with plenty of space, and does not need de-fragging.
This is a home computer that has never run a game, nor very large apps, in it's life.
It mostly surfs the internet on demand, and is rarely left connected to the internet for more than 4-6 hours at a stretch.
Clean-up attempts so far : I have run in Safe Mode - iExplore, JRT, Tdsskiller, AdwCleaner. Malwarebytes Anti-Malware found over 70 infection on the C: drive, and cleaned them all out. Subsequent runs in Safe Mode have found nothing. iExplore found nothing (twice). Tdsskiller I believe also came up empty handed. AdwCleaner found and deleted some intrusions also, post Malwarebytes attempts. All of them currently report zero problems. Yet the slowness remains.
Hoping someone can help. I'm an application test manager by trade, so you can talk tech speak to me if you want. ;)
Look forward to working with whomever I'm assigned.