ot any windows cleaners that actuly work — UK Media DVD Forum — DVD MP3 AVI MP4 players codecs conversion help

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OK I believe there is some knowledge out there . Can you help me.

My computer is slowing down. (real slow)
Is there any windows repair, service, speed restoring software that
actually works.

I know I could do a new install but this computer has huge programs and
enormous data files and lots of them, so it would take a full week to
reinstall at least.

What are my realistic options?

TIA

Gary