Yes and yes.

Goldy, just read the options during the install procedure so that you can choose not to add the Yahoo toolbar if you don't want it. That is the only option that I uncheck.

Colin

I just installed iolo system mechanic and it worked great was wondering if I should install the antivirus with it or stay with my AVG free version

A user should only use CCleaner in the default settings unless they are experienced.

The included registry cleaning utility should only be used if a user has registry experience.

DA

AVG is an excellent Anti-Virus. None better in my opinion.

txKen

another option to use similar to ccleaner is ATF we suggest it very often on the help forums, and I agree do not mess with registry cleaners unless you happen to be a specialist in that area.
ATF-Cleaner
they give directions there on that page also

for anti virus I currently use and love AVAST, used to use AVG now prefer AVAST, the key is to go with one of the ones that are highly rated on the antivirus polls whether it be a free or paid product. I participate in and refer to the great user polls at BBR/dslr like this one.
Preferred Anti-Virus Programs - 2009 Member Choice Software Forum Member Choice - dslreports.com

I have always used CCleaner's registry cleaner without having a problem. It always prompts to back up first and I let it delete anything it chooses. I haven't the faintest idea about registries. I've been using it for years on all my computers.

Jane

Jane,

Today with so many applications integrated with other applications and/or configured to the O/S, in the politest way possible I say that you are lucky.

DA