|Why did it take you ~ 19 days to respond ?|
Why didn't you answer this question....
"What is it you want to be able to do ?
You may NOT need a high end sophisticated program like AutoCAD to do that."
Your info in response 3 doesn't help much. You need to quote exactly what the error message said.
See the system requirements for AutoCad I pointed you to. The error message MAY have been about your computer NOT meeting one or more of those requirements.
There may also be info about the error you got on the maker's web site.
If you didn't right down what the error message said and are no longer getting that error, you may need to un-install AutoCad 2007 in Add or Remove Programs , then install it again, then write down the error when it occurs.
If your computer meets or exceeds the minimum requirements for AutoCad 2007, your problem MAY have been caused by anti-malware software interfering with the installation of the software.
AutoCad is a very sophisticated, complicated program. You're more likely to have software installation problems caused by that than for less sophisticated programs.
NOTE that sometimes the resident module(s) of anti-malware programs - a part that runs all the time scanning for suspicious activity - will interfere with the proper installation of third party software, or major Microsoft updates that cannot be installed automatically by Automatic Update, the software will not install properly, and you may get no indication of that at all while installing the software.
To avoid that possibility, you should always DISABLE the resident module(s) of anti-malware programs, BEFORE you install third party software (software other than most Microsoft Updates, etc., that did not come with Windows ), especially when it's a major or complicated software package.
E.g. if you are using the free or paid version of AVG, you should disable the Resident Shield in AVG's 's settings in Windows (in AVG 2012 that's done under the title AntiVirus). In Norton (Symantec) products, there may be several things you need to disable, or set so they don't load for a specific short amount of time.
If you don't know how to do that, tell us which anti-malware software you are using.
When you are sure the software has installed correctly, re-enable the resident module(s).
How to disable your security applications