I have an approx. three and one half year old compaq desktop that came with a 500 megahertz processor and a 13.5 gig hard drive. The hard drive crashed and I had it replaced with a 20 gig used hard drive that had been removed from another computer for upgrade purposes. Everything works until I connect to the internet. Within about two minutes after connecting, the whole system locks up. Someone told me it may be the modem. I replaced the modem with a new one. It didn't help. I'm a novice but can follow explicit instructions.
Donald Miller