Constant file system shield scan.

Hi,noticed avast scanning C:\ProgramData\Microsoft\Search\Data\Applications\Windows\MSS.chk every 5 seconds or so,have put it in the exclusions for now,any thoughts why this happens ?

Also i have pc tools firewall plus but it has not been updated for years and is not supported now !

would you recommend another firewall ? although this was has been fine.

TIA.

I think the latest version of PC Tool Firewall is 7.0.0.23 http://www.softpedia.com/get/Security/Firewall/PC-Tools-Firewall-Plus.shtml but there are several other free firewalls that are updated more frequintly such as OnlineArmor, Privatefirewall, Comodo firewall, there is still the stand alone free Outpost Firewall but is also not updated anymore as you can also install the Outpost free security suite with custom install options and choose only the firewall by unticking the other options.