do you maybe use bit defender? i remember when i used it for a short time, it ate away and fragmented my memory so badly i couldn't run pretty much anything. forget about stuff like java which uses tons of ram. "Could not reserve enough space for object heap." was a pretty common message i was getting.
even if something ran, it was slowed down so badly it was pretty much unplayable.
even if something ran, it was slowed down so badly it was pretty much unplayable.