I evaluated the Antivirus Software Internet Security 7.0 from Kaspersky Lab for a time and all in all it worked good but then I kept getting this message and sent Kaspersky support an email about it saying:
"I keep getting this firewall message that Executable file has been changed. It started a couple of days ago and it shows up several times a day. Please advice how to always allow this or what the problem is. The dialog box says: Firewall - Executable file has been changed. File has been modified since last scan. It can be regular update or infection. Should the program be granted network access? Process name: SVCHOST.EXE Process ID: 1600 Manufacturer: Microsoft Corporation Version: 6.0.6000.16386. The allow option says: Information about the file will be updated in the existing application rule. In future this activity will be allowed automatically. The problem is that still this warning shows up many times per day."
Three weeks later and still I have not got a response on this other than the automatic emails. "...your response time may exceed 24 hrs. We apologize for this delay and ask that you visit the technical support site at http://usa.kaspersky.com/support/ for answers to common questions..."
I later also found out that I cannot purchase their product from Sweden. I could not even buy it online.