Why is my computer so slow? There are a great number of factors which can slow down your computer. Generally if you have less than 1mb memory (RAM) the speed can be increased by adding more memory. Other factors can be: your disk is getting full; you have too many open programs; the disk drive is faulty and the computer needs to read many times to get or write data; and You may have a virus or other malware... call us for a check-up. I just reloaded Windows (All versions) and can't connect to the Internet After installing windows, you must install the motherboard drivers which were supplied to you when you bought your computer. These drivers describe the functions available on the motherboard to Windows and make available the ethernet/USB/Audio services as well as the most efficient ways for Windows to use the CPU that is installed.