Rdyboost.sys – Pre Service Pack 2 Revision History for Windows 7 SP1
18-Oct-2012 – 6.1.7601.22137 – Rdyboost.sys – x86/x64 – http://support.microsoft.com/kb/2775511 – An enterprise hotfix rollup is available for Windows 7 SP1 and Windows Server 2008 R2 SP1
23-May-2011 – 6.1.7601.21732 – Rdyboost.sys – x86/x64 – http://support.microsoft.com/kb/2555428 – The Windows 7 startup process is slow when you create many restore points
23-May-2011 – 6.1.7601.17620 – Rdyboost.sys – x86/x64 – http://support.microsoft.com/kb/2555428 – The Windows 7 startup process is slow when you create many restore points
Mpio.sys – Pre Service Pack 2 Revision History for Windows Server 2008 R2 SP1, Windows 7 SP1 and Windows Small Business Server 2011 (SBS2011)
29-Mar-2012 – 6.1.7601.21953 – Mpio.sys – x64 – http://support.microsoft.com/kb/2670762 – MPIO does not log path failure events in the event log on a Windows Server 2008 R2-based computer
12-Jan-2012 – 6.1.7601.21896 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2661794 – MPIO does not remove a disk that is on a failed path in Windows Server 2008 R2
27-Aug-2011 – 6.1.7601.21802 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2591462 – A boot LUN can be disabled if it is claimed for use with MPIO in Windows 7 or in Windows Server 2008 R2
28-Jun-2011 – 6.1.7601.21758 – Mpio.sys – x64 – http://support.microsoft.com/kb/2549567 – “0x000000D1” Stop error message when you back up files to a storage device on a computer that is running Windows Server 2008 R2
20-May-2011 – 6.1.7601.21731 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2522766 – The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2
04-May-2011 – 6.1.7601.21720 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2406705 – Some I/O requests to a storage device fail on a fault-tolerant system that is running Windows Server 2008 or Windows Server 2008 R2 when you perform a surprise removal of one path to the storage device
19-Mar-2011 – 6.1.7601.21687 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2511962 – “0x000000D1” Stop error occurs in the Mpio.sys driver in Windows Server 2008 R2
11-Mar-2011 – 6.1.7601.21680 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2460971 – MPIO failover fails on a computer that is running Windows Server 2008 R2
15-Jan-2011 – 6.1.7601.21642 – Mpio.sys – x86/x64 – http://support.microsoft.com/kb/2277904 – You cannot access an MPIO-controlled storage device in Windows Server 2008 R2 after you send the “IOCTL_MPIO_PASS_THROUGH_PATH_DIRECT” control code that has an invalid MPIO path ID
You may find that when you have a large hard disk drive the number of restore points that are retained causes the Windows 7 boot plan to exceed the file size of 512 kilobytes (KB). 512 KB being the precached limit means that the boot plan is no longer cached and causes the system startup to be slower. This is due to the fact that each restore point needs to be verified during system startup and as a result gets included in the boot plan.
A hotfix is available from Microsoft KB 2555428 that resolves the issue http://support.microsoft.com/kb/2555428
You may experience very slow system start up on occasion, this is due to Windows carrying out an unnecessary validation of the WMI repository. This validation is very time consuming and slows the overall start up and login process down.
A Microsoft hotfix is now available KB 2617858 http://support.microsoft.com/kb/2617858 and should resolve the slow startup by preventing unnecessary validations of the WMI repository.