Hello this time help is really needed. Now I’m going bonkers after the following re-installation over a non-SP1 version 7600 Windows7 Ultimate. Using the .exe ISO file X17-59465 posted here @ Digital River (by Jan Krohn) is the file that should be used to “inject” the missing SP1 into the faded Windows 7 Ultimate that is messing up my computer. For precautions I did back up the important files on separate HD and noticed at the installation that the drive where the new SP1 Windows 7 was to work from “only” had 342GB of free space for a file of 3.09GB. After installing this SP1 upgrade file and installing the updates post SP1 (139 were chosen by default) and prior to installing the Microsoft Office 2007 suite – same as was installed on this HD – then I noticed that the C: drive disk space had shrunk with 33GB. This leaves - at time of writing - only 310GB of untouched free usable space.(Where did the rest of the free usable 155GB got lost; I should have 465GB of untouched space to use?). Today after restarting the computer (it is with SP1, product id number and has the evaluation period) my screen got messy again with the numerous small tiles obscuring the Windows desktop: this after having performed a secure online payment and (for safety reasons) checking the bank account for the amount that was withdrawn did not exceed any suspicious sums of money withdrawals; it checked out to be okay. (Before shutting down the computer today I’ll perform a thorough scan with the recommended MSE). The unexpected caused an automatic re-start [with choice to boot in Safe Mode (with networking)] that I can’t be blamed for initiating. Why did this happen and can a partition manager help me with restoring the missing 155GB? Thank you for step by step help with this erratic behavior .