I have contacted Google to have this warning removed!
The server where my charity humour site resides was was hacked about 4 months ago, and malware was spread across all sites, not just mine.
It was picked up within an hour and the sites were all taken down, servers cleaned and sites reloaded.
Why Google has suddenly, after all this time added one of these warnings is beyond me and this is why I contacted them first thing this morning to have this rectified.
The current security log on Google for my site confirms that there has been no malware etc on there for over 90 days (see below)
I had already removed the link to Squiffys House Of Fun Laughter for MS from my signature, so am not sure why or how this warning is poping up..
Diagnostic page for www.shof.msrcsites.co.uk
What is the current listing status for www.shof.msrcsites.co.uk
Site is listed as suspicious - visiting this web site may harm your computer.
Part of this site was listed for suspicious activity 1 time(s) over the past 90 days.
What happened when Google visited this site?
Of the 62 pages we tested on the site over the past 90 days, 0 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2013-10-01, and suspicious content was never found on this site within the past 90 days.
Malicious software includes 26 exploit(s).
This site was hosted on 1 network(s) including AS15418 (FASTHOSTS-INTERNET).
Has this site acted as an intermediary resulting in further distribution of malware?
Over the past 90 days, www.shof.msrcsites.co.uk
did not appear to function as an intermediary for the infection of any sites.
Has this site hosted malware?
No, this site has not hosted malicious software over the past 90 days.
How did this happen?
In some cases, third parties can add malicious code to legitimate sites, which would cause us to show the warning message.
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If you are the owner of this web site, you can request a review of your site using Google Webmaster Tools. More information about the review process is available in Google's Webmaster Help Center.