A common occurrence, especially on older computers, is to have your mouse freeze on the computer. This occurs when you attempt to move your mouse, but it is stuck on one place on the screen. Generally, the only way to fix this problem is to shut down and restart the computer.
Not Enough RAM
RAM, or Random Access Memory, is the computer's real time memory. It allows you to perform tasks on the computer like writing in a word processor or using a video editor. The most likely reason your computer is freezing is because your computer does not have enough RAM for the tasks you are attempting to perform. You computer can become overwelmed by the extensive information and lock up. In order to get around this issue, either add more RAM or perform fewer tasks at the same time.
The next likely problem that may be causing your mouse to freeze is that you have a computer virus. If you are not performing very strenuous tasks (such as checking your e-mail) and your mouse still locks up, chances are you may have contracted a bug from the Internet. To correct this, run a virus scanning software and remove all problems the scan finds.
If you don't remove files at will, chances are this will not be the cause, but it can occur occasionally. There are dynamic link library files (.dll) that are used by multiple programs on the computer. If one of the programs is removed, occasionally the .dll file will be removed as well. If this happens, the other programs that use the file may not perform properly and can crash. To fix this issue, you may need to reinstall the program.