Microsoft has been tracking some odd issues that occur on Windows 7 and Windows Server 2008 R2. These bugs are not typically fixed via Windows Update, because these hotfixes should only be applied to systems that are experiencing specific problems. So if you are not severely affected by either of them, wait for the relevant service packs. Here are the four most prominent issues, listed in order of decreasing severity.
The third issue is described in KB978789 and specifically applies to computers with chipsets from the Intel 5 Series or the Intel 3400 Series families coupled with Windows 7 Home Premium, Professional, or Ultimate.
System Manufacturer/Model Number Keeps changing - (Custom) OS Windows 7 Professional x64 CPU Intel Core i7 860 Motherboard Gigabyte GA-P55-UD4P Memory 4GB DDR3 Mushkin 1600Mhz @ 7-8-7-20 Graphics Card MSI GTS250 1GB DDR3 Twin Frozr Sound Card Onboard realtek Monitor(s) Displays Samsung SyncMaster 24" P2450 + Samsung 20" 2033 Screen Resolution 1920 X 1080 and 1600 X 900 (#2 system 1440 X 900)
Keyboard Gigabyte USB keyboard Mouse Microsoft wireless laser mouse 5000 PSU Corsair 750 HX Modular Case Lancool PC-K62 Cooling Cooler Master TX3 CPU cooler and 4-140mm and 1-120mm case Hard Drives Patriot Inferno 120GB SSD + 3 WD Blue 640GB drives Internet Speed 7 Mb down 1.5 up Other Info System #2: AMD Phenom II X6 1055T (Freezer 7 Pro cooler) - Gigabyte 880GMA-UD2H - WD 500GB Black - 9500GT (1GB) 500W OCZ modular PSU - Antec 200 case. System #3 (LapTop) Core 2 Duo T6670 - 320GB 7200RPM HD - 4GB DDR3 RAM.
System Manufacturer/Model Number home built OS windows 7 ultimate x64 CPU intel i5 750 Motherboard asus p7p55d-e modded 1601 bios to get 11.2 intel option rom Memory 16 gig ram ddr3 @ 1333 9-9-9-24 CR2 Graphics Card evga 460 GTX 1 GIG SC Sound Card asus xonar D2X Monitor(s) Displays dell 2209WA Screen Resolution 1680x1050
Keyboard microsoft business ps2 keyboard Mouse microsoft optical black mouse PSU coolermaster silent pro 600watt modular Case antec P182 Cooling artic freezer 7 pro rev 2, 3 case fans Hard Drives Samsung 830 SSD 128gig - boot device wooosh - P55
WD black cavalier 640gig WD6401AALS - P55
WD 500gig WD5000AAKS - P55
Seagate 500gig ST3500630AS - P55
Samsung 750gig HD753LG - Marvell ide mode (drive doesnt like ahci) Internet Speed 30 meg cable Other Info All drives listed as P55 using AHCI