I have a HP 524C 1.80gig processor, 40 gig harddrive, 512 mb memory. running 2000 pro,I purchased this computer used. The previous owner replaced xp with 2000 before he sold it to me. The computer started to lock up on the internet after I had it for two months. Neither the mouse or the keyboard would work so I would have to pull the plug to shut it off. It also locks up when I tried a spybot scan even in safe mode. I ran Belarc Advisor it says the hard drive is healthy, it's missing several microsoft security hotfixes. I download updates for 2000 but they won't install.I tried running a PC Rescue Toolkit disc but it won't run because the system is missing rundll32 exe file is the operating system no good or do I have a hardware problem?