Lehr
You are more than probably right, it is highly unlikely that LW can or would do anything to ruin your computer.
However, it is possible that some malware could have crept into your PC, possible using LW as a conduit, and has changed some registry settings.
As you already have an AV, I would suggest you run a battery of Anti-Spyware apps to see it there is anything there.
Ad-Aware:
Ad-Aware by Lavasoft - Antivirus software, free spyware removal, firewall
SpyBot:
The home of Spybot-S&D!
Malwarebyte:
Malwarebytes.org
MS Malicious Software Removal Tool:
http://www.microsoft.com/security/ma...e/default.aspx
Good Luck
UK Bob