Please remember to only rate my answer when you are 100% satisfied. IF you feel the need to click either "Helped a little" or "I expected more", please stop and reply to me via the REPLY or CONTINUE CONVERSATION button with the issue you have. I will be happy to continue further and do everything I can to provide you with the service you seek.

1. Please remove the devices like printer, scanner, camera, USB stick from the computer.

2. Stop the startup programs to load automatically:

Please click Start, in the search box, please type msconfig and hit Enter. You will see system configuration utility. On this on the top right hand side corner, please click Tab Startup. Now, at the bottom on the right hand side, please click Disable All . Please click Apply and OK. Now, you will see an option, Restart. please click Restart.

3. Please click start, in the search box, type cmd , you will see cmd in black color at the top. Right click on that cmd and click Run as an Administrator. Now, click continue. On the black screen type sfc /scannow and hit Enter.

4. If you are not able to follow step 2-3, please restart thec into safe mode with networking as under:

How to restart the computer in the safe mode with networking:

Turn off the computer. As soon as you restart the computer, IMMEDIATELY start hitting F8(You will find this key on the top-line of the keyboard). Now, by using up and down arrow keys on the keyboard, please choose Safe Mode with Networking. Now, hit enter twice.
Please login to your user account.

I suggest you to scan your computer using the free version of anti-malware software. This will remove all of the malwares, spywares, viruses from the computer.

Note: If you have anti-virus programs like Norton, mcafee, CA, kaspersky installed on the computer, still I suggest you to download and install Malwarebytes as the Anti-virus program does not remove Malwares generally.

Please open the following link and download free version of malwarebytes.

http://www.filehippo.com/download_malwarebytes_anti_malware/

Please click download the latest verion on the top left hand side and install it.

After that, click Quick scan and click start.

It will take around 10-15 minutes to scan. Once the scan is complete. You will see a link, "Select All". You will click "Select All". After that you will click "Remove Selected"

Then you will see a pop up with options, Yes or No. Click Yes and this would restart your computer.

If not fixed, ask me again instead of leaving me negative feedback like:"Helped a little" or "I expected more", I will provide you new steps.

Please restore the computer to factory settings as under:

1. Make sure the computer is turned off ("Shut-down" from the Windows Start menu)
2. Remove any peripherals such an external mouse, keyboard, monitor, USB flash drive etc.
3. Make sure the AC Adapter is plugged in and working.
4. Press and hold down the 0 (zero) key on the keyboard while powering on the computer. Release it when the recovery warning screen appears.
5. If the recovery process offers a choice of Operating Systems, select the appropriate one for you.
6. A warning screen appears, stating that when the recovery is executed all data will be deleted and rewritten.
7. Click Yes to continue.
8. When the Toshiba Recovery Wizard opens select "Recovery of Factory Software" or the appropriate option for your needs.
9. Continue to follow the directions restarting as necessary.

First of all, please make CD/DVD as the first boot device on your computer.

Please turn off your computer.
As soon as you restart your computer, please start tapping (hitting up and down F2 key, if this does not work, please use F1 or Del or Delete key)
YOu will enter the Bios.
choose Boot sequence by using up and down arrow key and make cd/dvd rom as the first boot devices.
Please save these changes and restart your computer.

Insert the recovery disk.

Restart the computer, IMMEDIATELY, start hitting Space bar key..

This will start loading from Recovery disk.

Thank you.

It should not take more than 30-40 minutes.

Also, we change the boot sequence in BIOS. So, please follow the steps provided.

Thank you. Before you leave please Rate my Answer.

If not fixed, ask me again instead of leaving me negative feedback like:"Helped a little" or "I expected more", I will provide you new steps.

Well, nothing can be done if CD is not working. I can only provide the best possible instructions to fix it.

Please contact Toshiba for operating system disk or recovery disk.

http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/navShell.jsp?cf=su_contact

Also, please reset the computer as under:

IF it is a laptop:

Turn off the laptop.
Disconnect the power cord.
Now unplug the battery. You can turn it over to remove the battery.
Now hold down the power button on the laptop for 1 minute.
Now, connect only power cord and restart it.

If it is a desktop:

Turn off the computer.
Disconnect the power cord from Main supply.
Now hold down the power button on the tower for 1 minute.
Now, connect only power cord and restart it.

If not fixed, please contact Toshiba directly using the link below and ask then for operating system disk to reinstall the operating system.

http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/navShell.jsp?cf=su_contact