After my modpack crashed I cant re-open the modpack.

[Loaf Man]

Im playing the 1.7.10 pack and the it crashed and returned me to the technic launcher. The I click play it loads for like 3 seconds and just stops. The only way I can paly again is to restart my pc.  

 

[B#822] java.io.FileNotFoundException: D:\technic\modpacks\the-1710-pack\bin\natives\avutil-ttv-51.dll (The process cannot access the file because it is being used by another process)
[B#822]     at java.io.FileOutputStream.open0(Native Method)
[B#822]     at java.io.FileOutputStream.open(Unknown Source)
[B#822]     at java.io.FileOutputStream.<init>(Unknown Source)
[B#822]     at java.io.FileOutputStream.<init>(Unknown Source)
[B#822]     at net.technicpack.utilslib.ZipUtils.unzipEntry(ZipUtils.java:76)
[B#822]     at net.technicpack.utilslib.ZipUtils.unzipFile(ZipUtils.java:136)
[B#822]     at net.technicpack.launchercore.install.tasks.UnzipFileTask.runTask(UnzipFileTask.java:59)
[B#822]     at net.technicpack.launchercore.install.tasks.TaskGroup.runTask(TaskGroup.java:85)
[B#822]     at net.technicpack.launchercore.install.InstallTasksQueue.runAllTasks(InstallTasksQueue.java:49)
[B#822]     at net.technicpack.launchercore.install.ModpackInstaller.installPack(ModpackInstaller.java:42)
[B#822]     at net.technicpack.launcher.launch.Installer$1.run(Installer.java:124)
[B#822]     at java.lang.Thread.run(Unknown Source)

This is what comes up in red in the technic launcher console. Any advice??