I do not like to delete, I leave in quarantine, that way should there ever be a case where it was a false positive and it was an essential part of the OS it is easy to go back and put it back where it should be. As Zep said once they are in quarantine they are safe and locked away. I think you are correct in thinking that if you choose the option to take out of quarantine it will indeed put them back in to the pc so you do not want to do that. However you said you showed 30 trojans in your list, I highly advise adding malwarebytes to your programs you use and update it and run full scan with it weekly. That is a LOT of trojans and I really would be concerned depending on which ones they were. Many are not fully removed by AV programs.

If you are indeed 32-bit: Open the AVG interface. On the Toolbar select Tools>Advanced Settings. In the appearing window on the left side click on the plus in front of Update. Click on Manage. On the appearing right panel select the lower bar Revert Virus Database to Previous Version. If all goes well and the problem was only a corrupt dat file this could resolve your concern. However, if the concern is a by-product of the recent version upgrade you will have to remove AVG entirely and re-install. Be sure to use the removal tool. If you had no problems until recently I wouldn't go back to v9. The prior version before the recent upgrade, 10.0.1191, should be just fine. Da Here is a link that might be useful: AVG 10.0.1191

You should not blindly react to one article from another country!! For the real story: PRESS RELEASE AVG Press Statement Regarding Problems from Product Update Last update: 2:24 p.m. EST Nov. 11, 2008 AMSTERDAM, Netherlands, Nov 11, 2008 /PRNewswire via COMTEX/ -- AVG is actively working to remedy the problem some users are experiencing related to the most recent update to commercial and free versions of AVG 7.5 and AVG 8.0 in some languages. A number of users who installed the update mistakenly received a warning that the Windows system file user32.dll product version 5.1.2600.3099 was infected with a Trojan virus and were prompted to delete a file essential to the operation of Windows XP. The problem only affects users of the Dutch, French, Italian, Portuguese, and Spanish language versions of Windows XP. AVG is taking these steps to assist users in remedying the problem: -- Immediate release of a new update to correct the problem. -- Creation of a specific informational section on the AVG website that enables users to resolve the problem. Affected users should follow the weblinks below for further information and to download the fix tool: (1) http://www.avg.com/support/HotTopics1574 FalsePositiveuser32.dll (2) http://www.avg.com/support/HotTopics1574 FalsePositiveuser32.dll - fix tool Affected users unable to use their PCs should contact their AVG reseller or ask a friend to download the information and fix tool for them. After running the fix tool, users should run the AVG update program to download and install the correct AVG update. AVG sincerely regrets the inconvenience users have experienced. We are working to remedy the problem and ensure that any other potential vulnerabilities are identified and eliminated before they can impact users. SOURCE AVG http://www.avg.com Copyright (C) 2008 PR Newswire. All rights reserved End of Story http://www.marketwatch.com/news/story/AVG-Press-Statement-Regarding-Problems/story.aspx?guid="58A31585-DD3E-4930-81C6-0DCFB355DF8D>

if they are all in the vault they should be safe but why don't you go run this free online scan and see what it says just to be sure. FREE Online Virus Scan let me know, I am glad you ran malwarebytes and that it showed clean that is good.