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Try this method of removing temporary files instead, I suggest:
Search for Disk cleanup
and select it from the list of results.
Under "Files to delete," select the file types to get rid of (i.e. Temporary Files in this case).
Then click on OK.
Let me know whether this helps. Also try monitoring disk and CPU activity levels in Task Manager, to make sure it is working... if there are many Temporary Files, it may take over 20 seconds.
That is plenty. 480 MB of Temp Files is a lot, believe me.
That could well have improved your performance.
Try closing all programs, restarting the PC.
Then at startup and just after logging in, run Disk Cleanup again, being sure to select both
Temporary Internet Files
and clean those up. If there really is 2.3 GB of temp files, this may take at least 30 minutes to run.