# Otii app crash on Win7 x64 **URL:** \ **Category:** Support\ **Created:** [August 16, 2018, 8:59am UTC](https://forum.qoitech.com/t/otii-app-crash-on-win7-x64/200 "2018-08-16T08:59:53Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jdp](https://avatars.discourse-cdn.com/v4/letter/j/c6cbf5/32.png) [@jdp](https://forum.qoitech.com/u/jdp)\ **Post date:** [August 16, 2018, 8:59am UTC](https://forum.qoitech.com/t/otii-app-crash-on-win7-x64/200/1 "2018-08-16T08:59:53Z")
Hi, Just installed Otii v. 2.0.0. At first I could not create “new project” because I had not yet created an account. (the tool did not crash systematically at this time). After I did that, and I entered my user/pass into the pop-up, the tool crashes after startup. I lauched a VissualStudio instance to see if I could get more details on the problem (not very informative though): Unhandled exception at 0x000000013FECE755 in otii.exe: 0xC0000005: Access violation reading location 0x0000000000000018. Using win7 x64 with all the latest patches, ect. Could it be some issue with antivirus? Regards, Jonas ---
**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\ **Post date:** [August 16, 2018, 10:08am UTC](https://forum.qoitech.com/t/otii-app-crash-on-win7-x64/200/2 "2018-08-16T10:08:46Z")
Hi Jonas, This crash could be due to low VBUS power. Try connecting the Otii Arc to another USB port or a powered hub to get higher VBUS voltage. There is a bug that makes the application crash due to this and this is fixed in a later version. Best regards, Björn ---
**Author:** ![jdp](https://avatars.discourse-cdn.com/v4/letter/j/c6cbf5/32.png) [@jdp](https://forum.qoitech.com/u/jdp)\ **Post date:** [August 16, 2018, 10:26am UTC](https://forum.qoitech.com/t/otii-app-crash-on-win7-x64/200/3 "2018-08-16T10:26:05Z")
Perfect. Problem solved. Thanks!