I have a Dell Inspiron 1720 runnin Windows Vista. Recently, it was working fine, then locked up. I did a hard re-boot and got the same thing ... locked up. After that, if it started Windows at all, it would lock up on the icon screen. I ran a diagnostic and it gave me a long code (which I have somewhere) but I had my 19 year old son look it up and he showed me that it was a hard drive error. No problem right? I can get a new hard drive. Well, I did and it didn't help. I still had the same problem, so I took the new hard drive out and put the old one back in and tried to reset to factory settings with the original OS disk. Still have the same problem. Now, I have run the on board diagnostics and I get two codes. The first is 2000-0146, which is a hard drive error and the second is 2000-0147, which is an Optical Drive problem. Of course, the optical drive problem could be the reason that I can't get the OS disc to cooperate, but I am at a loss. I've researched and found that I can't find an answer. I'm desparate at this point. Do I replace the optical drive (we use it A LOT) and try to reinstall Vista and perhaps replace the old hard drive with the new one, or do I throw it out the window? If I start in safe mode (any of them) it locks up on crcdisk.sys every time, which also indicates a hard drive issue. What do I do? Help please???