This is a strange thing: I have 10 computers. On 9, avast is detected by SP2, no problem... On the 10th, Security Center says no antivirus software is installed... Avast is working perfectly on that system too... Is there any way I could make SP2 to SEE avast on this PC? I've tryed reinstalling avast, with uninstall & all... No effect... I don't want to reinstall SP2. Thank you in advance.