AVG Anti-Virus Free Edition 2012
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Full user review
"This version incompatible with Spybot Search & Destroy."
It's free and I have never had any issues with it till now...
AVG Anti-virus Free Edition 2012 became corrupted, causing Windows XP (yes, I still have it on one computer) to freeze upon loading to the desktop.
I've been using AVG free for years, and never had any problems other than the system resource hogging. While I have used it alongside Spybot Search and Destroy for years as well, unfortunately the free 2012 edition was corrupted somehow...a web search indicated spybot flags it and removes some files? Anyways, booted into safe mode and uninstalled AVG, computer is back up and running smoothly. May try reinstalling 2012 at a later point.