Hi All, My house mate recently purchased a refurbished Dell unit which came complete with Windows 7 Pro Fully installed and activated etc. However on starting it up we have come across an unusual error. We are unable to install any software on it what so ever however and cannot run some programs. The PC came complete with the Software fully installed and activated and it has a genuine Key on the top of the unit. I am really stumped as to what to do as we have purchased something now that we cannot use properly. It has the following basic Specs: INTEL Pentium D Dual core (3.4 x2) 1 TB Ultrastar SATA HDD 4 GB DDR2 Ram DVD +/-RW Error Codes: I have come across this error code alot https://nsis.sf.net/NSIS_Error Progress so far: Im quite apt at running stuff under compatibility mode and turning off the UAC ect so all that has been done. I have no issue with rooting around in the registry so I have already made a backup copy of it. any help would be appreciated many thanks.