Hi Micke and welcome to Tech Help Forums. Please note that many users of illegal software claim they lost their CDs while moving, yet we have no way of proving or disproving whether someone is telling the truth - so this puts us in a bind. Is this person honest or not? Do we help a thief or not?
Since you are not asking how to crack your copy of Windows, I will offer a little advice, but I strongly recommend you go out a buy a new legal copy of Windows as soon as possible. Then control your CDs responsibly. This is important because illegal software users are a MAJOR source of malware, and a major security threat to the rest of us, because, like you, they have not updated their systems with the latest security patches and updates. Badguys target these vulnerable systems and use them as tools to spread spam, viruses, Trojans and spyware.
I recommend you do 3 things:
1. Run CCleaner to free up space. It is a great disk cleaning program that is excellent at cleaning the system of 1000s of temporary files, including all history, old logs, and cache files. During installation, uncheck the option to install the Yahoo toolbar. Before first use, go to Options > Settings > Advanced and ensure Only delete files in Windows Temp folders older than 48 hours is unchecked. To delete all "tracking" cookies, (which I urge you do), you must delete all cookies, so ensure the Cookies setting remains checked. Ensure you know your site credentials (user name and password) for sites you frequent; you will have to login again at next visit.
2. Move your Page File and My Documents from C: to another partition.
3. If still not enough room, buy Partition Magic - a useful tool to resize partitions.
Okay, 4 things.
4. Buy a new Windows license.