Game publisher Rockstar's confirmed that the PC version of GTA IV has been delayed from November till December 2. In addition, minimum specs have been released. And here they are:
Minimum System Requirements
OS: Windows Vista - Service Pack 1 / XP - Service Pack 3
Processor: Intel Core 2 Duo 1.8Ghz, AMD Athlon X2 64 2.4Ghz
Memory: 1.5GB, 16GB Free Hard Drive Space
Video Card: 256MB NVIDIA 7900 / 256MB ATI X1900
Recommended System Requirements
OS: Windows Vista - Service Pack 1 / XP - Service Pack 3
Processor: Intel Core 2 Quad 2.4Ghz, AMD Phenom X3 2.1Ghz
Memory: 2 GB (Windows XP) 2.5 GB (Windows Vista)
18 GB Free Hard Drive Space
Video Card: 512MB NVIDIA 8600 / 512MB ATI 3870