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This Computer does not have Enough Space for Temporary Files
http://www.vistaarticles.com/articles/254/1/This-Computer-does-not-have-Enough-Space-for-Temporary-Files
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Published on 12/10/2006
 
When you try to upgrade a computer to Windows Vista.

This Computer does not have Enough Space for Temporary Files
To resolve this problem, set the active partition to a partition type that is not hidden. For example, set the active partition to type 0x7. To do this, follow these steps:1. Use the Windows Vista DVD to start the computer.
2. On the Windows Vista installation screen, click Next, and then click Install Now.
3. Press SHIFT+F10 to open a command prompt.
4. At the command prompt, type diskpart, and then press ENTER. 
5. Type select disk 0, and then press ENTER.
6. Type select partition 1, and then press ENTER.
7. Type detail partition, and then press ENTER. The partition attributes are displayed. Specifically, notice that Hidden: Yes is displayed. Note the volume number for this volume. For example, assume that this volume is displayed as Volume 0. 
8. Type select volume 0, and then press ENTER.
9. Type attributes volume clear hidden, and then press ENTER.
10. Type detail volume, and then press ENTER. Verify that Hidden: No is displayed.
11. Type exit, and then press ENTER to exit the Diskpart tool.
12. Type exit, and then press ENTER to exit the command prompt.
13. Restart the computer by using the original operating system, and then start the Windows Vista installation.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
300415 (http://support.microsoft.com/kb/300415/) A description of the Diskpart command-line utility
For more information about the Diskpart tool, visit the following Microsoft Web site:
http://technet2.microsoft.com/WindowsServer/en/library/ca099518-dde5-4eac-a1f1-38eff6e3e5091033.mspx?mfr=true