Deleting Temp files is a good idea it releases drive space and reduces places where files can hide.

Computer slowdown can be caused by too many temporary files clogging up your system. If you've check your hard drive, you you will find files with a .TMP suffix or a tilde (~) prefix, such as thisfile.tmp or ~thisfile.dat. These are temporary files, and it's almost always safe to delete them.

As applications process and manipulate data, many create temporary files. Often these are used as emergency backups and sometimes for temporary storage while the program does some other type of processing. This is especially true of applications that handle large files: word processors, image-manipulation programs, desktop publishing applications, or video-editing tools.

The applications create temporary files and uses them when necessary, the applications should delete the temp files when it's time to close down. Sometimes the application itself is buggy and fails to erase the temporary file and sometimes the program never gets a chance to shut down correctly and erase its temp files because your system, or at least that application, has crashed or locked up.

Lets start by deleting any files in the recycle bin... The recycle bin is not a storage area it's a bin and we empty bins..  Right Click on recycle bin and select "Empty Recycle Bin" as  below.

Now lets start deleting temp files in the TEMP folder by using the RUN command

click start and run>> type %TEMP% as below and click "OK"

This command opens up your temp folder as below

Higlight one file and click CTRL + A which highlights all the temp files, then simply delete all the files in this folder...Some files may not be allowed to delete just skip these.

Don't worry they are only temp files.
Ohh yes then empty recycle bin...

After deleting these files its always a good idea to run Defrag..

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