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Try Before You Buy!,
This review is from: AVG Internet Security 7.5 (PC) (CD-ROM)
For anyone considering purchasing AVG Internet Security, I strongly recommend first installing the trial version and giving it a through going over before handing over your money. Although I had been very impressed with the free versions of AVG Anti-Virus, Anti-Spyware and Anti-Rootkit, the addition of AVG Firewall and other 'improvements' in this all-in-one package inexplicably wreaked havoc on my well-specced Windows Vista machine.
Dreadful slow-downs, unresponsive applications, haphazard acceptance prompts and unrecoverable hard drive corruption caused by having to hard-reset the machine led to my swift removal of AVG Internet Security. My previous good experience of AVG applications prevents me from totally condemning this package - who knows, it may work with your particular setup - but I would certainly recommend fully backing up your system and thoroughly testing the 30-day trial version before comitting your entire system security to AVG.