Oracle Universal Installer throwing error

I've installed a dual-booting OS running Windows XP and Windows 2000 Server on two partitions, namely: C:(NTFS), D: W2003Server(NTFS partition) on 40GB each. They are running absolutely fine. Now when I tried to install Oracle 9i Server on W2K Server, in the initial stage itself I'm unable to proceed further, i.e., Autoplay is run and it comes up with an Oracle 9i Server Installation Screen which prompts the following options:

1. Install/Deinstall Products
2. Explore the CD
3. Browse the Documentation

When I select Install/Deinstall Products then it comes back with an error message as follows: "Oracle Universal Installer: Error in writing to directory C:\Documents and Settings\Administrator\Local Settings\Temp\OraInstall_15aug2007pm. Please ensure that this directory is writable and has at least 25MB of disk space. Installation cannot continue."

I have logged in as administrator and i successfully copied 60 MB to the folder without any error. Now what could be the problem and how to resolve this issue? Any leads would be greatly appreciated.

./runInstaller –debug