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dll What is alttab.dll?
AltTab.dll is a type of DLL file associated with Microsoft Windows Vista Promotional Pack developed by Microsoft for the Windows Operating System. The latest known version of AltTab.dll is 1.0.0.0, which was produced for Windows. This DLL file carries a popularity rating of 1 stars and a security rating of "UNKNOWN".
alttab.dll common file locations:
%windir%\SYSTEM32\ALTTAB.DLL
Details of alttab.dll
Bits & VersionFileSizeDescriptionChecksums
6.0.6000.16386 42 kb Windows Shell Alt Tab
6.2.9200.16384 66 kb Windows Shell Alt Tab
6.1.7600.16385 45.5 kb Windows Shell Alt Tab
6.3.9600.17031 77 kb Windows Shell Alt Tab
6.0.6000.16386 47.5 kb Windows Shell Alt Tab
alttab.dll error messages
Some commonly known alttab.dll error messages that can show up on your computer are :
The file alttab.dll is missing.
alttab.dll Not Found.
This application has failed to start because alttab.dll was not found. Re-installing the application may fix this problem.
File alttab.dll not found.
alttab.dll not found. Reinstalling might help to fix this.
How to fix a dll error manually?
Note: Do not fix a dll error manually if you are not a computer professional & don’t know what a dll error is and how a dll error occurs. If you do so, there are high changes that you may damage some parts of the registry and some applications would fail to load.

It is important to register the dll so as to avoid any dll errors. To do so, follow the steps listed below:
1. Click on Start.
2. Type “cmd”, right-click on the command prompt option and choose “Run As Admin”.
3. Hit enter.
4. Now type “regsvr32.exe “C:\Windows\System32\alttab.dll.
5. Hit enter.
6.Your dll will be registered.

How to fix alttab.dll Errors with Dll fixer (PC Speedup Pro) ?
Note: Avoid downloading the alttab.dll file individually from any DLL downloader site. If you’ve already downloaded it from these sites, remove alttab.dll from your computer and follow the steps listed below to avoid your system from behaving abnormal :

1.Restart your PC if you haven’t done that already.
This will clear up the remnants of deleted alttab.dll file. In case of any remnants, it is possible that the applications using components of that dll may cause the apps to misbehave. To avoid this, it is necessary that you restart your PC just after deleting the alttab.dll file.

2.Install Dll Fixer’s tool PC Speedup Pro from here. Upgrading the tool to its latest version will fix the alttab.dll error.
PC Speedup Pro registers the missing dll in your PCs registry so that the dll error does not occur again.

3.Run the tool and it will fix the alttab.dll error.
This tool not only repairs a particular dll error but also repairs other missing/corrupt dll files.

4.Click on "Start Repair" button once the scan is over.

This will fix your alttab.dll error.

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