Working on a computer running Windows XP home edtion Version 2002 Service pack 3
AMD Turion 64 Mobile
1.79 GHz 512 MB of Ram
I was told that the computer was running at a snails pace and they were about to throw it away. Once I got the computer I ran Malware Bytes in safe mode and the computer had 786 items. I let MalByte do what it does and it deleted everything. I then ran HitMan Pro and it removed a few more that MalByte did not find. Computer started running better. Still sluggish so I ran Combofix and it found a whole host of other items. After that I reran everything and it reported nothing found. The computer was running a 100 times better. I let the computer run overnight not connected to the net. I turned the computer on and off a number of times and it was booting fine and appeared to be healed. I left it off for 2 days and when I booted it up again it took 8 mins to boot up...( i timed it). I have rerun MalBytes and Hitman in safe mode and regular mode and it came back clear.
Can anyone give me an idea of what might have happend or what could be causing this?