Windows 7: Error 1305 when installing softwares.

currently having this problem and i don't know why... i look up google but they said it is DVD problem, but im trying to install from the Desktop itself not from the DVD-ROM. What's the problem? one of my friend who studied IT says its a virus.. i don't want to reformat my desktop.. a lot of important things. This thing made me can't install software or update my softwares... please help. I'm using x64-bit Windows 7 Home Premium

Clean out all of your hidden Appdata Temp Files after unhiding System and Hidden files in Control Panel>Folder Options>View. Reboot.

Download another copy of the installer, run as Administrator.

didn't work, im still getting the same error

This can happen when a lot of tweaking of the OS has been done, using optimizers, reg cleaners (besides CCleaner), etc.

If you've used those then unless you can System Restore to before the tweaks were done you're best off doing a Clean Reinstall then sticking with the tools and methods in the tutorial to maintain a perfect install.

If not then work through these Troubleshooting Steps for Windows 7 leading up to possible Repair Install.