black screen with moving cursor on startup

i have a problem, that later i learned that it was called "black screen of death"; when i bootup the system i can only see a black screen and a movable mouse cursor, but nothing to do.

i think it happened after i disabled lsass.exe from startup in msconfig with many other things.

i don't want to format my computer, and i don't have a windows vista cd, only acer's recovery cd, that turns the system to factory defaults i suppose; and windows recovery cd that i found from internet.

i found some solution advices in different forums and in virtualdr as well, but none of them helped me. first of all my system:

acer aspire 4720 / windows vista home edition

* Intel® Core 2 Duo T7300 (2GHz, 800FSB, 4MB L2 Cache), Intel® GM965 Express chipset,
* RAM: 2GB DDR2
* Harddisk: 160GB Serial ATA
* 14.1 WXGA Acer CrystalBrite™ TFT LCD
* Ekran kartı: Intel® GM965 Express Chipset

and what i tried till now:

1. clicking shift 5 times hoping a popup about the sticky keys will popup. nothing happened but a funny sound. / ctrl+alt+del does nothing either.

2. safe mode, no difference.

3. system restore, all the restore points gave an error. / and none of the alternatives in windows recovery were useful.

4. starting with system recovery, i could reach regedit. i tried to add lsass.exe to "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run", no difference.

5. when i looked to "HKEY_LOCAL_MACHINE\MySYSTEM\ControlSet00X\Services\RpcSs" (detailed explanation on http://www.logicitc.com/blog/?p=102) value on ObjectName was what it should be: "NT AUTHORITY\NetworkService"

do you have any advices? please help.

Thanks.

You have been infected with malware :( :(

I'll mov this over to the Security forum, where hopefully you'll get the help you need.

i scanned my pc with nod32 and ad-aware, they couldn't find anything.

then i tried to clean some useless or non-working stuff on startup, because of the slow boot, and errors at startup, and this happened.

i think my problem is something different.

nod32 and ad-aware [very very old] are just a start.

Read and follow the instructions here.
http://discussions.virtualdr.com/sho...d.php?t=197917

so, you think nothing to be done...
i'll inform you when i find a way.

If you have several known and unknown issues, starting over is often the best thing. Yes, there is pain involved but the end result is that you have a machine that is factory new again. Trying to repair/trouble shoot things like this takes more time than you sometimes realize.

I've sort of been where you are now and lived with a somewhat ailing PC for quite a while. Once I bit the bullet to start over from scratch, I kicked my self over and over for not doing it sooner.

If you do decide to start over, don't forget to save your data (music, photos, etc.) to a 2nd drive/CD's/DVD's.

Best of luck!

thanks han, but i cannot reach my data, that's the problem.