Hi everyone! This is my first post in this forum, and I really hope to get some help, because I am pretty desperate right now. I've already looked through other posts and Forums., but I have not found any solution there. I've also done a memory test, but no errors could be found. Last week I bought my new computer and installed Win 7 Professional 64bit. Everything seemed to work fine, but some installations (which worked on my laptop with Win XP) cancelled with strange errors. I thought this was due to my 64 bit installation of Windows 7, so I reinstalled Windows with a 32 bit version. (If someone asks if they are legal versions: yes they are). But the installation problems were still there. It seems as if my Windows installation says some .cab files which I try to install are corrupted. These are some examples of programs which I wasn't able to install: Microsoft Office 2007Microsoft Visual Studio 2008 (which I need as soon as possible)Call of Duty: Modern Warfare 2AVG Antivirus (although I managed to install an older version)DirectX (only in 64 bit; obsolete)If necessary, my PC configuration:AMD Phenom II X4 Asus M4A785TD-M EVO PowerColor Radeon HD 5770 GeIL DIMM 4GB DDR3-1330 I would be really glad if someone could help me out! Thanks in advance!