Grey is good, well Blue Grey
it isn't a bright Royal Blue.
What is your Operating System ?
If XP try scheduling a boot-time scan to see if it can get past the area of concern.
What settings did you use for the scan, Low/Standard/Thorough, with or without Archives ?
Does it seem to stop at the same point ?
Does it go to a BSOD or just a Black screen (possible hardware issues, heat, CPU, RAM, etc.) and reboots ?
If you can be as detailed as you can it would be appreciated and let us know a little more about your system
Try doing a scan with settings Low, without archives and see if that completes then perhaps a Standard scan also without archives.