Some icons change to a blue-white box

Because the hard disk space is too small, and because the built-in system of the notebook is the home Edition, it cannot meet my application requirements. The machine format is replaced by Winxp pro sp2 english edition.
It seems that there is a lot of space. And it seems a lot faster. Previously, the SWTOOLS directory under drive C was taken to drive E. Therefore, Lenovo's built-in software can also be installed.
After installation, it is found that the space is not large. Automatic Restoration is disabled and page files are moved to drive D, which solves the problem of GB space, but I still cannot meet it. Find out which files can be deleted under drive C. You can delete all files in the Temporary Folder and find that there are hundreds of megabytes of files under windows \ installer. What should you do with it? Are deleted. Well, there is a lot of disk C space. 15 GB of C disk space, installed a lot of software, of course, such as OFFICE big software or put in D disk, C disk there is about 9 GB of space. OK. Restart and check the effect.
It feels great to use. But I don't know when to start. The icons of office 2003, adobe reader8.0, Windows Live messager, nokiapcsuite, and other software have all become blue-white boxes! Click to run normally, but it is very awkward! The most unacceptable is that none of these program-type files can be identified by icons!
No, you need to adjust it. I checked it online. Oh, a lot of "icons suddenly become white boxes ". It seems that everyone shares the same feelings with me. However, the reply on the Internet generally says that the virus or its variants are in use. I checked it carefully and found no relevant features. No way. I installed a new system, installed patches, and updated several anti-virus software to the latest version.
I think about it again. I opened an icon and wanted to change the logo (but still cannot solve the file type problem ). In office 2003, the Change ICON button is Gray! For Windows Live messager, you can change it. Let's change it. However, when you click it, the following page appears:
Windows cannot find the file
% SystemRoot % Installder \ {C8B0680B-CDAE-4809-9F91-387B6DE00F6C} \ msn.exe
!
Suddenly open! Remember that you deleted these files. Delete the problematic ones one by one and fix them again. All solved.

Note: The office 2003 Installer cannot run normally, cannot install new or uninstall, and can be processed with Windows Installer cleaner.