I have an acer 4520 with default OS as Vista home basic. I upgraded it to windows 7 ultimate. Now I can't revert back to factore defualt settings , ALT + f10 not working(after enabling from BIOS) and I also don't have e-recovery on my notebook as I have upgraded my OS. what should I do to restore to factory settings.

Well there is no problem from upgrading the (OS) to windows 7 ultimate . because your laptop resources are not low.
regrading for the video driver issue .Download the drivers for windows 32 from
http://us.acer.com/ac/en/US/content/support

That a common problem it a OS upgrade. Try here: http://support.acer.com/us/en/product/default.aspx?tab=1&modelId=14

Windows 7 does not allow an upgrade from Windows XP. You would have to upgrade to Vista first and then on to 7. Also, it depends on which Vista you have that will determine which Windows 7 you can upgrade to. If you have Vista Home basic for instance, you cannot upgrade to Windows 7 Premium or professional. It is really screwed up. You can however do a clean install but you will lose all your old files unless you back them up on an external drive before running the new OS.

You have 2 options (purchase)
1. upgrade the win vista to win 7 - you need to check the type of win vista that you have if it is 32 or 64 bit or HOME BASIC HOME PREMIUM PROFESSIONAL ULTIMATE
home basic is not win 7 upgrade supported.

2. Win 7 OS full version disk.

Back up all of your files before doing anything on your computer.

The free upgrade is sent out by the laptops manf. directly to you as long as you bought the laptop in the past 4 months. It is regardless of the current version of Windows Vista that you are running. According to an article found here

"Acer says "shipments will begin in increments. All orders will be handled on a first-in, first-out basis." So if you bought a computer last week, you could be at the end of a long line."

Best you can do at the moment is just wait, your not going to be able to do much till Acer ships out that upgrade. Even if you did install Windows Vista Premium, you would be stuck till you got the Windows 7 from the manf.

what you mean is a downgrade... not an upgrade? Vista Ultimate has all the features and services compared to other versions of Vista.

When you want to downgrade, get a copy of home basic installer and run overwriting your previous OS

Under the Windows activation section, click the Change product key link. The window that appears will allow you to enter a new product key and thereby upgrade to a different version of Vista.

chek ur bios setting may be if there is recovery key just use that othewise download form the net.

I am using ACER (Aspire 4520), with Windows Vista BASIC & then once i have format my laptop & install Vista Ultimate on it from that time my webcam is not appearing on desktop & I am enable to use web cam & another problem is when I have install yahoo massager that was installed on the time I start working all of the sudden it disappear plz provide me solution of this
with regard
pawan sharma

partition your hard drive thats how you can run 2 operating systems on your computer im running xp pro and vista ultimate

i recomend you use vista ultimate it has it all