The FIRST thing people need to do when proceeding to install Windows 7, is to make SURE there are compatible DRIVERS.
IF the computer manufacturer does not offer Windows 7 compatible drivers, for the computer in question, DO NOT load Windows 7.
[ Drivers are small pieces of software written, so that the Operating System can 'communicate' with a device.
Windows Vista, and Windows 7 are two examples of an O/S.
Audio (Sound), Graphics, LAN, and so on, use a chipset.
This chipset is a device.
Chip and Chipset are slang terms for I.C.
Fortunately I looked, and Win7 drivers are available for the Acer Aspire 5536 Notebook PC,http://support.acer.com/us/en/product/default.aspx?tab=1&modelId=1119
BEFORE you install Win7, click on the Drivers, and download the compatible drivers for THE device in your computer, and the matching Win7 driver.
Burn them to a CD disk. Have ready to install.
[ Acer doesn't list what each driver is, until you click on Download, at the right side of the driver file.
Let's take Audio for one example.
There are 4 Audio drivers listed.
Click on Download at the right side, of the first Audio driver listed.
In the small window that comes up, you can see it is for WinXP.
XPx86. (Windows XP 32-bit)
It is also for a RealTek audio device. (Chipset)
(All the Audio drivers are)
Click on the second Audio driver listed. (Click on Download)
This one is for Vista
The third one is for Windows 7 that is 64-bit, OR 32-bit.
(Look at the Windows 7 carton. Does it state 32-bit, or 64-bit?
Doesn't matter for the above driver, as it is for both, but other drivers may be just for 32-bit, OR 64-bit.)
Go to Device Manager, and see what each device is.
(Click on the Windows start button, click on Control Panel, click on Performance and Maintenance, then on Device Manager)
Write them down. Download, and burn to disk the proper drivers ]
NOW, with the proper drivers available, proceed to install Windows 7.
(I have been told that some Vista drivers do work for Windows 7.
Need to make sure, as once you install Windows 7, it is a bear to try to reinstall Vista, if Win7 does not work)
Windows does not like to be written over, and Vista has a security measure that is better than previous versions.
Go to BIOS Setup, and in Boot Options, make sure the first boot device is CDROM.
As soon as the computer is started look down at the bottom of the screen.
You won't see the P.O.S.T. screen, but the Acer logo screen.
At the bottom of this screen, states what key to press to enter BIOS Setup.
(Power-On Self Test)
It may state something along the lines of;
enter Setup, or
enter BIOS Setup, or
Enter CMOS Setup. (Old. Doubt it)
This screen goes by f-a-s-t.
You probably won't be able to press the correct key in time, to enter BIOS Setup.
Simply restart the computer. As soon as it restarts, start tapping on the appropriate key. (In 2 second intervals)
You may hear a beeping as you are tapping on the key. This is a Stuck Key Error Code. Ignore it.
Should be the DELete key, or F2.
When you enter BIOS Setup you CANNOT use your mouse anymore. You use the Keyboard.
The navigation guide is at the bottom of every screen in BIOS Setup.
It doesn't state navigation guide, however.
There are two major BIOS manufacturers. AMI (American Megatrends Inc), and Award/Phoenix.
There are several versions of each, so I cannot guide you directly.
However if you need help just post what you see, and I will guide you.
For additional questions please post in a Comment.