Error 1905/HKEY access problems

Question

found this somewhere else
1) Click Start, then Run, then type regedit and press OK.
2) Open HKEYLOCALMACHINE, then SOFTWARE, then Classes. Scroll down to QuickTimePlayerLib.QuickTimePlayerApp (or whatever key that you're getting an Access Denied error)
3) Right click on it (you might have to do it twice).
4) Select Permissions after ignoring any messages telling you that you don't have access
5) Once inside Permissions, click Advanced, then Owner, then click on your account, then press Apply, then OK
6) Next click Add, then Advanced, then Find Now
7) Hold down the CTRL key and click on Administrators, your own account, and SYSTEM
8) Click on Administrators, then click the Full Control checkbox. The "Read" checkbox will automatically get checked, then press Apply
9) Do this for each account. Hopefully once you do it for Administrators the others will already have Full Control checked and "Apply" will be greyed out. Press OK when you're done.
10) Next click on CLSID back in the registry editor and repeat steps 3 through 9.
11) Try installing Quicktime again and when you get another Access Denied error, note the registry key and go back and repeat steps 2 through 9 for that key.
12) Keeping trying to install Quicktime until you've resolved all the permissions for all the keys that this pathetic setup script requires
13) Eventually it will install successfully.

Answer 1

caution: this can seriously mess up your computer if you do it wrong. proceed with caution