Black Screen-My sis will kill me

So, i was cleaning my sister notebook because it was full of unwanted programs,alot of unnecessary startup programs, so i downloaded tuneup utilities 2011(with registration key) and did all tuneup availables.
I also unninstalled like 40 programs plus++
I performed full avast scan, Full malwarebytes scan, Full trojan remover scan.
I had like 30+ restarting requests from the programs I was going to do them all in only one.
So after all the cleaning I've made, I decided to reboot it, But after that loading screen that says "Microsoft corporation", when it is going to enter account selection(doesn't show nothing) it gets black, blink, and then reboot.
I choosed to system not reboot in case of fail, then just stay a black screen, nothing else.
I can use safe mode normally(I'm posting from the notebook)
So I would apreciate some help, cuz if my sister know this, she would kill me because everything is always my fault.
And I don't have the vista installation CD(If there's no option i can download it no problem)
Things done so far:
-CHKDSK
-Prevent system from rebooting in case of system fail(Before this was just a reboot loop)
-Scan for Virus,Malware
-Driver update(Actually video driver only)
-Let it cooldown turned off
-Disable all startup programs at msconfig(Even thinking this wouldn't work because it doesn't even load windows)
Note: Tune up utilities made me delete alot of unused files, like old backups and system restores, and it cleaned alot of registry files after I've unninstalled a mass of softwares



So any ideas?

Update: I noticed something very strange after booting in normal mode:
Like in the black I noticed some slightly lighter black(very sligthly)screen poping down(Like resising) Twice.Now this is strange

I just dont get why all threads are answered less mine, but okay i will wait

Have you tried a startup repair? I think when you messed with the registry, you did more harm than good. Did you happen to back up the registry before letting tuneup utilities remove entries?

Jacee said:

Have you tried a startup repair? I think when you messed with the registry, you did more harm than good. Did you happen to back up the registry before letting tuneup utilities remove entries?

Click to expand...

The only backup i have is the Tuneup rescue center, that won't load in safe mode.
My computer doesn't have startup repair imbued with it, that means i'll have to download the vista iso, i was seeing i would have to do that anyway

You could try "Last good known" by pressing F8 (same menu as safe mode) before windows starts to load.