I am running Windows 7 RC in a virtual machine installed from the 7100.0.090421-1700_x86fre_client_en-us_retail_ultimate-grc1culfrer_en_dvd.iso that I downloaded directly from
Microsoft.
I have Avast antivirus on the Host machine.It flags the Win 7 Hard Disk.vhd as Win32:Adloader-AC [trj].I know its a false positive but I thought I would mention it here because
false or not I worry.
Avast is also up to date so I am kinda wondering what to do.I am currently scanning with other scanners just to be 100% sure.
I suggest you install avast in the client (virtual) machine also. And run it… maybe it’s not a false positive.
Anyway, you can exclude *.vhd files in the host machine avast installation.
Thanks for reporting.
Ok installed and updated Avast on my Windows 7 Virtual machine.Ran complete scan,its clean.Verified by another Virus scanner to.
The .vhd file when scanned with another virus scanner is clean.
I am gonna say False Positive.
Did not realize I could exclude .vhd files.May try that for now.
Funny I just ran another scan and its now saying its a Win32:Zbot-AVH [trj] instead of Win32:Adloader-AC [trj]
You need to use the Exclusion lists:
For the Standard Shield provider (on-access scanning):
Left click the ‘a’ blue icon, click on the provider icon at left and then Customize.
Go to Advanced tab and click on Add button…
For the other providers (on-demand scanning such as the screen-saver or the Simple User Interface):
Right click the ‘a’ blue icon, click Program Settings.
Go to Exclusions tab and click on Add button…
You can use wildcards like * and ?.
But be careful, you should ‘exclude’ that many files that let your system in danger.
Done…Thanks for the info.
I really like Avast,but seems sometimes to be a little over zealous with “false positives”.
I would rather it be that way then be less secure 
Also got a false positive from Avast about Clamwin when Clamwin updated.
I installed Clamwin beside Avast to double check the VM file.It was clean
with Clamwin.
After searching the web a bit and the forums here,I found several threads about “false positives”
in both the Virtual machine files .vmdk and .vhd files and Clamwin.
So I need not get all worried,now I can relax… 
Cool Thanks.I installed Clamwin just to check the VM file…after which I plan on uninstalling because 2 anti-viruses,
no matter the brand,just do not play well usually.
Watch out for alerts on clamwin as it doesn’t encrypt its virus signatures (update files aren’t encrypted either), so guess what, avast will detect them.