Turn off the computer, then hit the power button to turn it back on and immediately start hitting the F8 key repeatedly until you see SAFE MODE. Take the Safe Mode With Networking option (this will give you internet connectivity) and let it boot up. Safe Mode will look different to you, the screen will be darker and the icons bigger, this is normal. When it boots up, open your internet browser and download and install MalwareBytes and run a Quick Scan.
Go to www.google.com and in the search box type: "Download cnet Malwarebytes" (without the quotes). Download and install malwarebytes from the sites download.cnet/malwarebytes. When the site opens up click on the Green Download button on the left. Do not click the Red Download button, that's junk. When it finishes installing the Gui Interface will open up with an offer to Accept a Trial Version or Decline. CLICK DECLINE you want the totally free version. Run a QUICK SCAN. As it scans, if it finds infections the number will be in red. When it finishes scanning, click SHOW RESULTS. A notepad text document will open up showing you the results. You can close the text document and go back to the Gui Interface where you will click REMOVE SELECTED RESULTS. The objects will already be selected for you. When it finishes removing the objects click ok and it will sometimes reboot your machine. If the above steps does not fix the problem: Try another mouse and see if it scrolls.
"Stop: 0x000000A5" error message typically indicates that the computer BIOS is incompatible with the Advanced Configuration and Power Interface (ACPI) standard that is supported in Windows 7. However, this error can also occur because the computer hardware, the peripherals, or the drivers for those devices are incompatible with Windows 7.
Startup Repair from the Windows Recovery Environment (WinRE)
1. Insert the Windows 7 installation disc into the disc drive, and then start the computer. 2. Press a key when the message indicating "Press any key to boot from CD or DVD ...". appears.3. Select a language, a time and currency, and a keyboard or input method, and then click Next. 4. Click Repair your computer. 5. In the System Recovery Options dialog box, choose the drive of your Windows installation and click Next. 6. At the System Recovery Options Dialog Box, click on Repair your computer. 7. Click the operating system that you want to repair, and then click Next. 8. In the System Recovery Options dialog box, click Startup Repair.
Refer the following link for more information:http://windows.microsoft.com/en-US/windows7/What-are-the-system-recovery-options-in-Windows-7
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