Thanks. That looks like a windows installer error. I googled it these possible solutions although I don't think item 1 applies to your op sys
1. Update Windows Installer following the instructions from this Microsoft Article:
http://www.microsoft.com/downloads/details.aspx?familyid=889482fc-5f56-4a38-b838... 2. Change the permissions to full access to:
C:\Users\xxx\AppData\Local\Microsoft\Windows\ or C:\Users\x\AppData\Local\Temp\
1. Open Windows Explorer are locate the mentioned folder above.
2. Right click on the folder, the Local Properties pop up window will appear.
3. Select the tab Security.
4. Click Edit, the Permissions for Local pop up window will appear.
5. On Group or user names, select the desired user.
6. Ensure that the Allow check box for Full control is activated, else activate it.
7. On the Permissions for Local pop up window, click OK (if no changes were made) or Apply (if changes were made).
8. On the Local Properties pop up window, click OK (if no changes were made) or Apply (if changes were made).
If it doesn't work we will try to make a .net4 installer over the next month. Look forward to hearing if this helps. Out of interest what happens if you run the installer as admin from somewhere like mydocuments