After running Kaspersky (Full scan took two hours, but was recommended) my computer runs much faster and is so much better receiving emails.
The last time I purchased Kaspersky I removed it as it did not seem to get on with Windows in my opinion and was persuaded to go to Norton and then Bullguard.
I found Bullguard to be so intrusive and did not like it so I went onto the Computer Active shop, read all the reviews and thought what the hell give it another go (at such a good price) and so far so good as it has improved everything up to now.