Whenever i try to open skype, it says check online for the solution and close the program. when i tried to re install it, it said there was problem connecting to the download server. my laptop is acer aspire 5740 and i am using windows 7

sir jase hi tata docomo ki dongal dal kar cont karte hai tho kankting faild hata hai

The first thing that I would do is re-install skype.

reinstall
see if you have all the necessary files...
If not, try another install

Close the Skype application and try to exit that application which will be in the Notification area of the Windows right bottom bar.
Please remove the Skype in the Windows or Anti-virus application Firewall list and try to use the application again.

If you are using the Mac computer use the Skype version: 5.1.0.968

Be sure you check if you have the most recent version of skype first. Next check online what type of webcam you have, and update the drivers to the newest version. Check if it works, and if it doesn't then reset your computer. Check if any other programs running are using the webcam, and if they are close them. If that fails reinstall skype and try again.

try this online web cam test https://www.onlinemictest.com/webcam-test/
also check device mgr to be sure web cam is functional with drivers

try updating/reinstalling your video driver...

your system infected with virus, reformat the system or try to remove the most latest program installed.

Your camera is already online. Double click the camera icon in the lower right task bar and it will work. That is the problem, the program is trying to run twice. Again, the camera is online and working and the access to it is in the task bar at the bottom. You, of course, can change these setting if you like.

Hi,

To help resolve some common connection issues on Windows Vista, please
follow these steps:

1) Please make sure, that you are running the latest version of Skype
that you can download from http://skype.com/go/download

2) If Skype is running, please close it by right-clicking on the Skype
icon in the system tray (next to the clock) and selecting Quit Skype or
via File > Close.

3) If you are behind proxy server, make sure you have set all proxy
settings in Internet Explorer > Tools > Internet Options > Connections >
LAN settings and in Skype under Tools > Options > Connection.

4) If you are using Windows Firewall,
Go to Start menu > Control Panel > Windows firewall > Change settings
and select the Exceptions tab. Find Skype from the list, select it by
clicking on it once and press Delete. Click on Add Program and select
Skype from the list. If Skype is not on the list, click Browse and go to
C:\Program Files\Skype\ Phone\ and select skype.exe. Close the windows
by pressing OK button.

5) If you are using any other firewalls or anti-virus software, please
make sure, that Skype is in the exceptions list. We have firewall
guides at http://www.skype.com/help/guides/firewall.html .
If your firewall or anti-virus software is not listed there, please
follow the guide supplied with your software or contact the software
manufacturer for step by step instructions.

6) If you are using a router, please configure port forwarding for
Skype. You can find guides for an extensive list of routers on
http://www.portforward.com/english/applica.../Skypeindex.htm
Please note that we are not responsible for this page and contents
might change unexpectedly.

7) Start Skype

Make sure your status is set to online via "File" > "Change Online
Status" > select "Online".


If the above did not help, please try the following:
Go to Start > Control Panel > Administrative Tools and start 'Windows
Firewall with advanced security'. If you don't see "Administrative
tools" in the Control Panel, please make sure, that the Classic Mode is
selected from the left side of the Control Panel window.

Click 'Inbound Rules' > 'New Rule'. Make sure 'Program' is selected.
Click 'Next'. Select 'This program path' and click Browse. Browse to
C:\Program Files\Skype\Phone\Skype.exe. Click 'Open'. You are taken back
to the rules creation window, click 'Next'.

Check 'Allow the connection' and click 'Next'.

Make sure that all three options are ticked: 'Domain', 'Private',
'Public' and click 'Next'.
In the Name box type 'Rules for Skype' or whatever you like.
Description may be left empty. Click Finish.

Now select 'Outbound Rules'.

Click 'New Rule'. In the window that pops up make sure 'Program' is
selected.
Click 'Next'. Select 'This program path' and click Browse. Browse to
C:\Program Files\Skype\Phone\Skype.exe. Click 'Open'. You are taken back
to the rules creation window, there click 'Next'.

Check 'Allow the connection' and click 'Next'.

Make sure that all three options are ticked: 'Domain', 'Private',
'Public' and click 'Next'.
In the Name box type 'Rules for Skype' or whatever you like.
Description may be left empty. Click Finish.

Please restart your computer after doing this and try launching Skype
thereafter.

Finally you could try below:
This is a regular Vista idiocy, occurring from time to time to random applications and has nothing to do with Skype. Thanks, Mr. Gates.

How to fix it:

1. Go to your Skype program directory, then navigate to the subdirectory Phone.
2. Right-click the Skype executable, select Properties.
3. Go to Compatibility tab.
4. Select compatibility mode, and choose Run this program in compatibility mode - Windows XP Service Pack 2.