For half a months computer been having problems but not all the time. They are random times when My computer slows down accessibly. Opening files on my desktop slows down and some case or doesn't open. Many exe files doesn't execute and get stuck in loading time. When using the internet either firefox or windows internet explorer, it tends to get stuck on loading time. This has been occurring for three weeks, I had reinstall my computer clean the previous one. However it seems windows carried a windows old of my desktop and everything. I only delete after I discover it a day later. The trojan mnight been moved. I tried scanning with the latest updated Malwarebytes, Eset, SuperAntispyware, Avast!, ADWcleaner, Kaspersky, TDSSkiller, Lab all separately,They all found nothing. Last month I was here in another board and did combofix and it found nothing either. There are times my entire computer get stuck in loading time and I have to restart. Recently as today I tried updated malwarebytes but it gets stuck in loading time when it is updating. Also downloading any files whether is small tends to be slow and many times it gets stuck. I'm using windows 7 and I'm using cable so I am connect the computer all the time. Is there anyway to fix this without have to reinstall windows?