In vista system, there are three subfolders under appdata, local locallow roaming. If the path is not specified when extracting the package, the system will extract the compressed package to the local\temp folder and store some extracted files. When installing software, you will retrieve data from here, especially some drawing software, which is very large and takes up a lot of space.

Locallow is used to store * * * data, and the files in these two folders are cleaned by the optimizer, which can generally clean up useless files.

Roaming folder is also used to store some data files generated after using the program, such as space listening to music, login number and other cached data. These data optimization experts can't clean up. You can open all the files in the roaming folder and click Delete. If it cannot be deleted, you can choose to skip. However, when you use the program again, the folder will start to swell and cache data again.

If you don't understand this, download some optimization software, such as 360, win7 optimization master, and make a garbage cleaning system to slim down, and your problem should be solved.