disk cleanup
File Compression
Yes... Disk cleanup software is a program that scans and removes unwanted data and programs fro the disk being read. It's classed as a utility because it's not designed to be constantly running (like the operating system). Usually, you have to manually start a utility 'on demand'.
File compression
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debug
Disk Cleanup
Trend Micro's HouseCall is a virus scanning program for computers. It is a free utility. It doesn't protect the equipment, only scans and removes bad files after they have already installed. It is NOT anti-virus software, in that respect.
Disk cleanup, I believe. It's under accessories -> system tools
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disk scanner
Norton Security