PC Tune-up alternative?

[SlowOne]

I've loaded the AVG Virus software as recommended on here. It gave me the chance to use their PC Tune-up software, which seems to work well. My little notebook is now more hot hatch than shopping trolley!

Can anyone recommend a free version of this that I can run from time to time? I don't really want to pay for something (like virus software) when there may be a good, free alternative (like AVG Virus software!) available.

Thanks in advance for any advice.