In general most of us will agree that your PC have a RAM problem. But we need to be sure that it is the case. So u need to isolate the problems: 1. Anti Virus and MS Office installation problem From where u install the software? CDs? If it was from CD, then your have 2 possible problems which could be your CDROM or the data cable that attach your CDROM to the motherboard. If the problem still occurs after replacing the CDROM or the dat cable, then it is your RAM 2. Patching IE, can not find network connection Make sure you have configur your IE match to your internet connection. This means u check your proxy setup, and also your TCP/IP configuration. If problem still occurs, it is your RAM Since in the end u can not start your PC again, I think it is either your RAM or your motherboard have problems. Solution: 1. Attempt to move the RAM chip from one slot to the other available one. Your current RAM slot might got problem. By moving to other slot, u can test whether the current RAM chip still workable. 2. Replace your RAM. Make sure u got the compatible one with your motherboard. Check your motherboard RAM capability whether it can recognize PC2100 or PC2700 or even PC3200 RAM chipsets. 3. Replace the motherboard It is possible that your current motherboard can not function fully to its capability. Try it 1st. Do not buy new PC straight away. And good luck..