"CCleaner" by Piriform (www.piriform.com) is not an anti-virus utility!!! It doesn't have a 'scan for spyware/adware' option (or functionality)!
If you are getting anti-virus messages (or any other messages about spyware, adware, trojans, worms, etc) then you are not running a legitimate version of CCleaner ... period!
I seriously suspect your PC has been corrupted by a 'scare ware' virus/adware (pretending to be CCleaner). And, by letting it run (over & over?) you are probably exposing yourself (and all you e-mail contacts) to spammers, hackers, keyloggers/identity thief attempts, etc.
I've been running the free version of CCleaner 5+ years (thru multiple versions/upgrades) without it doing anything like what say is happening to your PC. As with all "clean-up" tools, you can screw-up your system by deleting things you should not so you should not "just let it run" without checking the results and knowing what it will delete, etc ... for that matter you shouldn't let any anti-virus, anti-adware/spyware, registry cleaner, or disk cleaner run unless you know it is a very well trusted product and that you obtained it from a very trusted, respectable source. You should always review and be careful (ie: have backups) should you decide to let any utility delete registry entries, disk files, etc.
Do yourself (and your friends) a favor: PLEASE run a known valid, brand name, up-to-date anti-virus tool that you obtain from a known valid vendors website (ie: Norton, McAfee, Avast, AVG, etc) ASAP to verify your system is clean!
And, NEVER, NEVER run software that just 'shows up' and says it will save you from all the evils of the world!