startup prob need help asap

[dlow4sure]

ok not quite sure what has happened but computer froze up on me and when i restarted i got a message stating "DIOGR compressed press cntr alt del to restart". I am new to windows 7 and have never seen this type of error before, can some one please start me in the right direction to fixing this problem, i dont have my install cd otherwise i would just reinstall windows and bypass all the problems

[Transfusion]

Was your main drive over 90% full? According to this Microsoft MVP:
http://answers.microsoft.com/en-us/windows/forum/windows_7-system/oekiu-is-compressed-press-ctrlaltdel-to-restart/5e14cca8-eeb9-4067-a69e-f8864440879b

Compressing your system drive is a bad idea. Here is a recipe that I picked up somewhere else. I have not tried it myself but it is supposed to fix this problem.
1. Start your computer from the Windows 7 installation DVD
2. Select Repair your computer.
3. Load driver.
4. Go to Computer and right click drive where Windows 7 is installed.
5. Select Properties and uncheck "Compress drive to save disk space".
6. Close and restart the computer normally.

Any Windows 7/Vista DVD will do the trick. No OS restore required.