Your Windows has been blocked - Ransomware targeting american people

This trojan blocker ( MD5: 0193afae6bd74de23d3bc1aec15bcacb ) prevents all software execution.
To remove the Trojan (and unlock windows), infected users need to enter a valid serial number.

Number to call: 1-800-255-5227
ANDI RAZVAN SIMION
STR. DACIA 73
BRASOV (Romania)

Unfortunaly there is no way for unlock the computer with a generic serial.

Manual remove:
1) Restart your pc
2) Before the Windows XP splash screen, press the F8 key to enter the Windows Advanced Options Menu and choose: Safe Mode
3) Type 'regedit' in the console and go here:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

You will see a key named "explorer.exe" with this path:

C:\Documents and Settings\%username%\Application Data\Microsoft\explorer.exe

4) Now you know the location, just remove the key "explorer.exe" with a right click
5) Now go to the folder:

C:\Documents and Settings\%username%\Application Data\Microsoft\explorer.exe

and delete "explorer.exe"
6) Reboot your computer.

Note for malware analysts: The ransomware do a network activity for defind the receiver.