Laptop unusably slow with Internet Security 2012 switched on

Hi,
I have a Sony Vaio laptop with Internet Security 2012 installed. Up until about 4 or 5 days ago it was working fine. Now the machine is unusably slow, and there is constant disk activity (but very low processor usage). If I turn Computer Security off it's fine again. Whilst it was off I checked for F-secure updates and one was installed. But the machine is still the same when I turn Computer Security on again.
Any ideas? Should I completely reinstall Internet Security?
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Hi,
create a diagostics, while the problem appears and submit a support request.
BR
If I can get the machine to actually respond, I will! But it is absolutely crawling along whilst computer security is on. Also, Windows Action Centre is reporting that virus protection is off, when in fact it is on - is this relevant I wonder?
Ok, I've just spent an hour and a half generating the report, created a support ticket and all I got was an error page back from the f-secure site. Tried twice and got the same result.
I've spent the whole day on this now and I'm very close to just removing f-secure and putting something else in its place.
Update - I eventually uninstalled F-Secure completely and re-installed. It's now working fine - fingers crossed it stays that way!
Hi, It is nice to hear that again it started working
Dear ,
Simply reinstall the F-Secure IS 2012 it will work fine.