You may want to examine the folder in details, and then delete it if you are sure, if it indeed contains temporary files. Change the location of the Temp folder in Windows.

For this, right-click on the installer, click the Select Run as administrator option, and then follow all the onscreen steps. Read: The Temp folder is on a drive that is full or is inaccessible. 2 ...

From this menu, you can change the space allocated to the storage of temporary internet files (Default value: 250MB). A larger cache implies that more data will be stored, thus allowing Internet ...