My inspiron 1545 when you start it up it has do you want to start windows normally and safe mode and safe mode networking and so on but when it comes to the desktop you get a blue screen with white writing and then it restarts. what should i do?

Remove the HDD and test, replace if necessary.

Follow this trick to fix infected Laptop:


Disable Unwanted Programs from Running at Windows Startup
Running too many programs at the Windows startup reduces the system performance. To speed up Windows 7, you have to disable the unwanted third-party programs from running at Windows startup.

• Click Start ' Type MsConfig and press ENTER
  
• Click Startup tab.
  
• Uncheck the entries of the programs that you do not wish to run at system startup.
  
• Click Apply.
  
• Do the same for the entries in the Services tab.
  
• Click Apply ' OK.
  
• Restart the computer when prompted.
  

To fix this problem instantly use PCFresher system utility.

Are you able to get to the desktop in safe mode?
Repeatedly press F8 on startup and choose to boot to safe mode in the options window.

Don't know what windows version you are running. See if
you can boot up in safe mode by tapping F8 key while
restarting, then attempt system restore to a previous
date when it ran properly.

1. Reboot the computer
2. Right after the bios is finished, hit F8 (or F2,10,12)
3. Select ‘Safe mode’ or ‘Safe mode with networking support’
4. Windows will boot up to the logon screen. Click administrator
5. Do, Start->Run->type ‘command’
6. To reset the password type ‘net user username *’ where username is the username you want to reset.
7. For no password, leave blank.
8. Now, reboot and you can login as that user.

Please press F8 several times during start up. When computer gives you few options of startup choose Safe Mode. Once in Safe Mode go Start----->All Programs---->Accessories------>System Tools------>System Restore. When you get there choose last date when system was working properly and restore to this point. I hope this helps and good luck.

you can update your operating system to solve this problem, your all old document will safe.

Actually your windows has become corrupt may be due to improper shutdown or power failure.
insert your windows cd and proceed with windows repair.
if you are still in guarantee period,call costumer support for recovery disk

1.Please shut down the computer. 2.restart the compuer and without wasting anyting start tapping F8 key(up and down.) on the keybord. You will see windows advanced option. 3.by using the up and down key on the keyboard, please select safe mode with networking and hit enter. 4. now, you computer will be restarted in the safe mode. 5. please try to install sp2 here.

Try to boot it to last known configuration.

Hope it will work.