please follow this link at AVG Free Forum about mentioned situation (+missing downloaded files) caused by system restore to fully reinstall AVG:
Are you using some other firewall? Like ZoneAlarm etc.
Try AVG9 installation in custom mode and untick "LinkScanner" component if the large files upload issue will be solved then.
Hi I am going crazy here and hope you can help!
Last week I upgraded to AVG 9.0 from AVG 8.5 and everything was fine except I could no longer attach large files in gmail (which I really need to do for my course, I'm talking 7MB) and so even though I tried disabling the surf shield in Linkscanner somehow I still couldn't do it so I uninstalled AVG 9.0 and instead installed the McAfee 3 month trial system.
The problem was I still couldn't attach big files (and really needed to) and somehow everything at this stage started going crazy.. to be fair I was fiddling around and trying to fix it myself and when I could no longer even open the document window to attach a file (something about the Data Protection thing getting involved) I decided to restore to last week when I still had AVG 8.5 and everything was fine in the hope that this would get rid of whatever I had done.
Since then it has been very slow, and today I tried to uninstall AVG 8.5. and re-install 9.0 (since I managed to send the large documents from my friends computer last night with AVG 9.0 and the surf shield unticked) but I can't uninstall the old version - it says installation failed and then when I click on details it says
Installer initialization failed due to following error:
Error: @AvgErrorCode_0x0253 %FILE% = "C:\Program Files\AVG\AVG8"
And I also can't download the new version - it makes all the signs and sounds that its downloading right but doesn't actually save the file to my PC, totally weird! It does the little ping at the end of the download and closes the window and all but then when I go to where I saved it (I tried both my documents and desktop) the file isn't there. Running instead of saving also makes all the right sounds but then it does nothing once the window has been closed. I also tried downloading from here http://free.avg.com/cz-en/download?prd=afg#tba2 but though it takes longer to download the file it's still not there when I look at where I saved it
I'm not entirely sure what my operating details are (sorry not hugely technical) but when I go to computer/properties it tells me I have Windows Edition: Window Vista Home Premium Service Pack 1
Model: Inspiron 1545
Processor: Intel(R) Core (TM2) Duo CPU T5800 @ 2.00GhZ
Memory (RAM): 2GB
System Type: 32-bit operating system
Any help totally appreciated!