The UVK system booster helps you to fix system errors, improve performance and free hard disk space.

It scans your registry and file system for errors and displays the results in a list where you can choose what to remove.

To access the system booster section, click UVK System Booster, in the Welcome screen. If it's the first time you come to this section, the UVK window will look like the screenshot below.

This screen will only be shown once. It's very self-explanatory. You should follow the instructions and perform the recommended actions. By doing so, you are ensuring the UVK system booster will run as it should, and you will be able to recover the registry entries and files in case something goes wrong.

If you accidentally click the Go to the System Booster button before performing the backups, you will still be able to perform any of these actions in the System booster section, as shown in the picture below.

In the left pane you have several buttons with actions you may want to perform before starting the scan.

In the right pane, you can select the areas you want UVK to scan.

 Invalid activeX/COM objects: These are the most common cause of Windows errors and performance issues. ActiveX/COM objects are exported by DLL, OCX and CPL files using regsvr32.exe.

Sometimes these files are deleted (when uninstalling a program, for instance) but the registry entries are left behind, leading to errors and performance issues. UVK will detect these invalid entries and display them in the list.

Before starting to scan this section, we recommend that you use the following options in the left pane: Register system DLLs and Run SFC scan.

Invalid file extensions: File extensions are very important. They tell Windows which program it should use to open a specific file type. For instance a .docx file extension will usually open with the Microsoft Ofice Word application.

Most applications register file extensions, but very few unregister them when uninstalling, leaving invalid file extensions behind.

UVK will detect these invalid entries and display them in the list.

Invalid shell extensions: Shell extensions are items displayed in the context menu of some specific or all files/folders.

Again, sometimes they are not removed by the applications when uninstalling. UVK will detect the invalid ones.

Invalid OpenWith entries: When you use the Open with.. context menu to open a file with a specific application, the Windows shell will save the path of that application to the corresponding file extension OpenWith list.

But what happens if the applicaton file is deleted? That list entry will become invalid. UVK will display the invalid ones.

Invalid shared DLLs: When an application wants a dll to be shared with other applications, it registers that DLL as a shared DLL. But sometimes the DLL file is deleted and the shared DLL entry is not. UVK will detect these.

Invalid application paths: In order to run a file only using its name (whithout the full path) applications may register the file in the application paths key. But most of these entries are not deleted when the executable file is. UVK will detect these.

Invalid Windows fonts: If a font file is deleted from the Windows fonts folder without uninstalling the font first, it will leave an invalid entry in the registry pointing to the deleted file. UVK will detect it.

Invalid uninstall entries: Sometimes errors occur while uninstalling an application, and often, the solution is to simply delete the application's folder, leaving the orphan uninstall entry behind. UVK will detect the invalid ones.

Invalid ShellMUICache entries: When you run an application, Windows registers its path in the ShellMUICache key. But sometimes the entries in this key are not removed when the files are deleted, becoming invalid. UVK will detect the invalid ones.

Invalid shortcuts: This feature will search your Desktop, Start menu, Recent and Favorits folders recursively for shortcuts pointing to unexisting files and add them to the list.

Junk files: UVK will search your hard drive recursively for unneeded files based on their file extension. The file extensions list to be used while searching can be edited. See below. UVK will display the files found and also their size in the list.

Restore points: These are not system errors, obviously, but since they use a big ammount of HD space, you may want to have them in a list so you can delete some of them.

You may edit the junk file extensions list. Just separate the file extensions you want UVK to search for with a | (vertical bar)

i.e. If you only want to search for dump and log files, use dmp|dump|log. The default list is $$$|bak|chk|dmp|dump|hdmp|log|mdmp|nch|old|temp|tmp|wri.

Each time you modify the list, UVK will ask you if you want to save the changes for future scans. If you click Yes, the new list will be the default list the next time you come to this section.

To restore the default list, just clear the current list and click Start Scan. UVK will automatically ask you if you want to revert to the default list. Click Yes to apply.

When you have it all set, click Start Scan. You'll be taken to the System errors scan section, as shown in the picture below.

UVK will now scan the areas you have previously selected.

You can stop the scan anytime, but if you do, you'll have to start it from the beginning, the next time.

Usually, the Invalid activeX/COM objects and Junk files areas may take a few minutes. All others only take a few seconds.

When the scan is complete you will see a message box similar to the one in the picture below, telling the number of errors found, and the total size of the junk files found.

Click OK. You may now take a look at the errors UVK has found. To do so, expand one of the tree branches.

Click an error line to select it. Now you can either right click the same line to open the context menu, just double-click it to open the System error properties dialog, or click Error item properties, in the upper pane.

The System error properties dialog will be similar to the one in the picture below:

The text fields in the dialog box give you some more info about the error item.

The Go button allows you to jump to the corresponding registry key.

The Search item with google button will perform a quick google search using the registry entry as keyword.

Right-clicking an error item line will open its context menu, as shown in the picture below:

To start a new scan, click Start a new scan in the menu, or New scan in the upper pane.

Export to text file will export the errors list to a text file in the path you choose.

Select the items you wish to delete by checking or un-checking the corresponding boxes. Changing the state of a checkbox in the parent branch will set the same state to the child lines. This can be useful to quickly change the state of an entire section.

If you do not wish to create a system restore point before start deleting the items, un-check Create restore point before deleting, in the upper pane. This is not recommended.

When you have decided which items to delete, click Delete selected items in the menu or the upper pane.

UVK will only take a few seconds to create the restore point and delete all the selected entries and files.

Note that the option to delete the items will only be available for registered users (who have purchased a UVK license key)

We have now a new non-branding license key that users can obtain for a more accessible price. More info here.

To return to the Welcome screen, click Welcome screen, in the upper pane or press Esc.