This model will run only effectively 32 bits WINDOWS. I have one and Win7 do not install .NET last versions (need 64bits) and this message appeared for me after I tried some drivers finding-update programs that had the .NET and 64bit problem. Forget them, those drivers programs. Go to dell site and install the drivers you find there for VISTA in WIN7, some will not work but there is nothing you can do … There is no drivers for WIN7 and U have to try Vista drivers in compatibillity mode. In WIN7 I could not have sound drivers (at least the p2 jack flaws) but an USB sound adapter (US$3) will solve better the problem (no old p2 malcontact). You can have Video drivers from nVidia (the nVidia updater installs it). With a SSD it is quite fast for an old Dell. The video is better than most notebooks!!