I have a dell inspiron 1520 laptop its about 2 yrs old now when it boots up i get an error sayin windows failed to start due to a recent hardware or software problem and i get the option of lauch startup repair or start windows normally when I start it normally the screen blinks blue then it goes black and reboots

I have a gateway laptop and whenever I turn in on, it wont go to the log in screen. I says :

Windows failed to start. A recent hardware or software change might be the cause. then there are 2 options Launch start up repair or start windows normally. When i clicked start windows normally, the green bar thing loads for like 5 minutes, then it just goes black. When I tried Launch start up repair, the results showed 1 root cause. It says system volume on disk is corrupt
repair action: file system repair (chkdsk)
result: completed successfully error code 0x0

Can anyone please help? Thanks in advance

My brother built a new computer based around a new processor and motherboard, (intel Quad-core Q6600 and Asus P5E), along with a new case so it would be compatible(Antec 900). After transferring over these new parts along with the necessary older parts the computer works fine except for one problem. Everything powers on, the computer gets past BIOS and then goes to boot windows but instead he gets:

"Windows Error Recovery"
Windows failed to start. A recent hardware or software change might be the cause.

If windows files have been damaged or configured incorrectly start up repair can help diagnose and fix the problem. if power was interrupted during startup choose start windows normally.

Launch startup repair(reccomended)
Start windows normally

Whenever he starts windows normally he gets the blue screen of death and an instant restart. If he launches repair it goes to a loading bar that completes in about 5 seconds then just sits at 100% and does nothing.
P.S.
We do not have a copy of windows vista, it came installed on the computer and we never recieved an actual copy.
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To Tina G
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He cannot get to the actual desktop to do any of that from, windows will not launch.

i have an acer aspire M5640 and when i press the start button a few seconds later i it fails to boot up with the following symptoms:

I get a message saying "Windows failed to start. A recent hardware or software change might be the cause. i says something about a installation disc and i dont have it. it also gives me the following options 1. Insert your Windows installation disc and restart the computer.
2. Choose your language settings and click next.
3. Click "repair your computer"

It also gives me the following options:

4. Safe Mode
5. Safe Mode with networking
6. Safe Mode with Command Prompt
7. Last known good configuration
8. Start Windows normally
none see to work. what can i do only a true geniusis can answer this so please help:)