vsbalint, try this. Uninstall the quickcam software. Since these things usually use a mess of tmp and chk files, bring up Windows Explorer and search for *.tmp - then delete them all. Then, search for *.chk and delete them all.
Then try to "cleanboot" your computer. What this will do is have the minimum running processes:
1. Click Start --> Run --> Type "MSCONFIG" --> Click OK
2. On the General tab, choose, "Selective Startup"
3. Uncheck "Process SYSTEM.INI file"
4. Uncheck "Process WIN.INI file"
5. Uncheck "Load Startup Items"
6. Click on the Services tab.
7. At the bottom, check "Hide All Microsoft Services"
8. After checking that, uncheck all boxes in the window or click the button labeled "Disable All"
6. Click OK
7. Click "Restart"
When Windows comes back up, install your software (remember not to attach the camera before you do this)
After performing the necessary steps, restore your system by doing the following.
1. Click Start --> Run --> Type "MSCONFIG"--> Click OK
2. On the General tab, choose, "Normal Startup"
3. Click OK
4. Click YES or "Restart", when asked to restart your computer.
Maybe then it will install.
