Doubts in Avisynth

[mgh]

Just two questions-
1. Have dual boot 98 and XP. 2.08 works well in 98 and 2.5.5 in XP. 2.5.5 crashes in 98 with virtualdub plugins.2.08 crashes in XP at random.Why? Would love to use 2.5.5 in both because Directshowsource loads both video and audio with 2.5.5.
2. Will this line in avisynth script prevent audio video sync problems with most videos?
delayaudio((Framecount()/Framerate())-(AudiolengthF()/audiorate()))
Am almost a newbie-so please excuse if i have asked stupid questions.

[Wilbert]

1. Have dual boot 98 and XP. 2.08 works well in 98 and 2.5.5 in XP. 2.5.5 crashes in 98
1) Are all scripts crashing? If not, post the shortest script which is crashing.

2) Is it crashing in VDub?

2) Did you empty avs plugin dir?

[mgh]

2.5.x scripts with virtualdub filters are crashing in virtualdubmod 1.5.10.1 and all other versions that I have of virtualdub in My Win 98 SE.
Absolutely no problem in Win XP.
e.g.
loadvirtualdubplugin("F:\filter\autolevels.vdf","al")
DirectShowSource("E:\video\VIDEO.MPG")
converttorgb32()
al(20,20,20,0,0,0,0,0)
Works in XP without problems, crashes in Win 98 SE.
Moved everything other than
colors_rgb.avsi
DirectShowSource.dll
TCPDeliver.dll
out of my avisynth 2.5.5 plugins folder. Still the problem persists.
Happens whenever any virtualdub plugin is used. Otherwise, there is no problem.

[mgh]

Virtualdub error message
VIRTUALDUBMOD caused an invalid page fault in
module KERNEL32.DLL at 0197:bff9da1a.
Registers:
EAX=0228008c CS=0197 EIP=bff9da1a EFLGS=00210202
EBX=0229feb0 SS=019f ESP=0227ff70 EBP=02280090
ECX=0228003c DS=019f ESI=02280198 FS=597f
EDX=022800b0 ES=019f EDI=022800b0 GS=0000
Bytes at CS:EIP:
50 51 ff 75 08 8d 85 e0 fe ff ff 50 ff 75 0c e8
Stack dump:

Never tried it in TMPGEnc before. Tried it after adding converttoyuy2(), works!!