I have had troubles running SW2011 service packs 0,1, and 4. Mostly occasional freezes, but it got much worse lately so I figured it was time for a system re-install (it's been a few years and i had SW2010 and 2011 on the CPU). Today I wiped my system, fresh install of Win7 Pro, and started installing SolidWorks. I used the DVD, and tried selecting the straight online update to SP5, hoping it would circumvent any issues I had with SP4. The installation failed, so I installed SP0 from the DVD, then tried downloading and installing SP5. It failed multiple times giving me "Error Writing to file", for files such as sldanalysistools.dll, slderresu.dll. I tried skipping files, but just had more errors. I aborted the update, then tried disabling antivirus (MS Security Essentials), and ran the SW installation manager->check for updates as Administrator. I am still getting error 1310 error writing to file, The Installation Manager does not have permission to modify this file. Any deas? Install logs attached.